too many Elspeths

Why is four too many?

ok, so too many Elspeths like mentioned above. you should have many walkers with the same subtype (even if different cards) cause you can only have 1 out at a time so the rest just clog up the deck. Elspeth, Knight-Errant is arguably the best iteration of her, at least the best for this deck so go with just that. have 2 of that and 2 Ajani and Gideon is fine.

next take out Spear of Heliod . its not really that great and honestly IMO Path of Bravery is better 90% of the time. if you have a decent amount of creatures (tokens or normal ones), once you get a Path out you should be getting a decent amount of life just for attacking, which keeps you alive and gets them the bonus really easily.

you have a soldier deck, so Field Marshal would fit in perfect if you can afford him. if not, Auriok Steelshaper works in a pinch, with some good equipment such as Veteran's Armaments . also, best white removal that isnt outrageously expensive is Path to Exile .

Ok, I'll put Elspeth Tirel in the life gain deck I'm working on. Spears out, two more honors in its place. I think my lgs has two Field Marshal 's I'll pick them up when I can. If I can get another Elspeth, Knight-Errant I'll replace Elspeth, Sun's Champion with her.

Regarding your sideboard, you could consider:

• Kataki, War's Wage -- although not a soldier, he (she? it?) is fairly backbreaking against Affinity
  
• Stony Silence -- also good vs affinity and shuts down Birthing Pod
  
• Ethersworn Canonist -- also not a soldier but great vs Storm, which generally doesn't run many answers
  
• Rest in Peace -- one of the best graveyard hate cards there is

All these types of decks are prominent in Modern.

Outright drop one of your Captains of the Watch. You have 61 cards and I question this decks ability to get one out in a timely manner, would be a pity to have both in hand during that period of time. On a related note, since this deck isn't token oriented, maybe drop a couple plains for a couple Nykthos, Shrine to Nyx .

Ooh, yeah, didn't notice the 61 cards. Cut one!
I'm not sure Captain of the Watch is great for you, honestly. 6 mana is too much to expect to reliably cast it so it's only really good with Preeminent Captain . of which you only run three.

m4ver1k and KrosanTusker ~ I dropped the one Captain of the Watch . They are/were pretty much in here as placeholders until I could/can get 2 more Hero of Bladehold

Nykthos, Shrine to Nyx is something I'm actually considering getting, I'm just not sure I want to put 10+ dollars on a land. However, If I did get them, I could see myself being able to run 3 Captain of the Watch 's and get a fourth Preeminent Captain to bring them out more reliably?

I like all the suggestions you guys threw up. All great sideboard options. One's I'm most interested in are Rest in Peace and Stony Silence (since I'm sure I already have one of each and it would be easier to acquire the other 1 of each I would want to run).

I do want 1 more Thalia, Guardian of Thraben

I've been thinking about 2 Torpor Orb , 2 Nevermore , and 3 Grand Abolisher

Preeminent Captain is a 3 drop. Remember that you have to tap 3x lands to activate and take advantage of Nykthos. So it will not benefit Preeminent Captain.

It would make Captain of the Watch's easier to get out, but I'd play test it a bit. Maybe even proxy these suggestions beforehand and make sure you like the way it plays out. In fact, do that.

Rest in Peace/Stony Silence/Torpor Orb are good sideboard options. I'd actually run Ghost Quarter in the sideboard as at least a 3x of after those initial 3. Ghost Quarter slows down Storm, Tron, and Infect pretty well.

I probably should clearify, I was thinking the fourth preeminent captain in order to help bring out captain of the watch more frequently along with the shrine.

I forgot all about ghost quarter.