Since you're running Avacyn, you might as well throw in a Worldslayer...and your Blade of Selves will work wonders with your Inferno Titan. Coat of Arms, Gratuitous Violence and Purphoros, God of the Forge will help out, and as far as another mana rock, either Gilded Lotus, Thran Dynamo, Chromatic Lantern, or Caged Sun are ideal. As far as instants go, Swords to Plowshares and Warleader's Helix are both helpful. The only land I could think of to help you would be either Valakut, the Molten Pinnacle or Emeria, The Sky Ruin I know most of these cards might be a little on the more expensive side for you, but just wanted to add some thoughts that might help. Good luck!

Thank you for your suggestions and your consideration. You are correct, most of these are out of my budget range. I have the mindset of as long as I find it useful and it is close to $5 ($10 if I really am attached to the concept), I am willing to slowly acquire it over time. Here is my thoughts:

Worldslayer - Nice thought, but a bit too risky in my opinion. I only have a 2/99 chance to get both it and Avacyn, Angel of Hope at the same time (3/99 if you consider the tutor power of Stonehewer Giant). Looking back, I now realize that Bearer of the Heavens has the same effect, but I guess I didn't realize it wiped lands too. Very situational so I will consider it for my SB.

Coat of Arms - Expensive, and since this is only a psuedo giant/angel tribal probably will not be as effective as most pure tribal decks.

Gratuitous Violence - Don't like the double edge aspect of it. Yes I will hit them hard, but I will be hit just as hard. I've seen this one used frequently in Gisela, Blade of Goldnight EDH decks.

Purphoros, God of the Forge - I don't feel I have the frequency of creatures to have this work effectively. I like Warstorm Surge just a little bit better since usually the creatures I do cast are larger.

Gilded Lotus/Thran Dynamo - I like the concept, but a bit too high of price for my taste. I've had Thran Dynamo on my Maybe list ever since I started this deck.

Chromatic Lantern - I don't really have trouble with having the wrong color at the wrong time. So about $8.50 for a mana rock that produces one mana of any color is a bit steep for me.

Caged Sun/Valakut, the Molten Pinnacle/Emeria, The Sky Ruin - I feel that all of these would be a lot more effective in a mono color EDH deck. Since I am practically running a 50/50 , I feel like I wouldn't get their full benefits. Caged Sun is probably the most likely option of something I would use, but Emeria would require almost all of my Plains to start taking effect and Valakut wouldn't trigger all that often unless I get my mana searches. I would be a bit more considering of Valakut or Emeria if they didn't come into play tapped. I've never really liked when lands do that, even more so for a single colored land.

Swords to Plowshares/Warleader's Helix - I like the price tag and the effects. Swords to Plowshares would help me against my friends Reanimation deck. Warleader's Helix does decent damage and is tutorable via Sunforger. The CMC seems a bit high for the overall effect though.

Thank you again for the suggestion.

I would say instead of Warleader's Helix, run Lightning Helix, although it may be more expensive. I mean, the only difference is 2 mana for 1 more damage and 1 more life. A few cards that I added are Armillary Sphere, Burnished Hart, and Sword of the Animist, since I want to be able to pump out big creatures earlier. Some equipments that I want to run are Argentum Armor for removal of annoying enchantments such as Painful Quandary, which has a reputation for being utterly evil in Commander, and Deathrender for being able to cast some creatures for free. Legion Loyalist is another option if you're willing to open up your wallet a bit.

Thanks for the additional comment MRDOOM3 (thanks to scrobacca as well. I accidentally forgot to mention them in my last comment). Here are my thoughts:

I definitely like the CMC associated with Lightning Helix. It definitely has more bang for your buck so to speak compared to Warleader's Helix (which is why it has the greater price tag). I added both Helixs into my Maybe board until I can get around to purchasing one (or both).

I already am running Armillary Sphere and Sword of the Animist for their ramping ability. I shoved Burnished Hart off on the side board likely because I didn't fully read it's ability. A sac outlet that give two tapped mana to the field is an awesome ability. I'll likely switch him with Oreskos Explorer since it's ability seems to be hit or miss when I use it.

Argentum Armor - I like what I see there (aside from the 6 to play, 6 to equip). Once you get the ball rolling with this it seems like it would be hard to stop. I like that it is 'permanent' and not 'creature'. That gives you a lot of choices. This can possibly be a hit or miss with me since I usually go up against a Meren of Clan Nel Toth deck and destroying only brings fuel for the fire (unless I repeatedly kill Meren).

Deathrender - I liked it on first glance, but one of the only things I don't like is that it will not trigger my commanders leveling. On the plus side, it would help me get around the forced sacrificing aspect of the Meren of Clan Nel Toth deck. On the down side, it may give my opponent ideas to start running it and abusing the cheating in cards with its sacrifice engine. I am very on the fence with this one.

Legion Loyalist - Interesting aggression ability tied in with it, however, I could see it not surviving more than one combat because of it. The trample aspect of it's ability is very tempting though...

This deck is amazing! Consider an Obelisk of Urd to buff the shit out of your giants or angels.