I do have trackir 5 (which is simply amazing), and I didn't know COD doesn't have good support for 3 monitors! That really sucks. Well, I think it does. Can't say for sure since I've never used 3 monitors

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Despite the game apparently not (yet?) living up to its potential - I do love this game. It'll be my main game for years to come. I also play DCS warthog and p-51, and will be playing blackshark/etc. However, I don't see myself drifting too much from COD. I really like the WWII genre and would rather dogfight than manage BVR combat.
Thanks for the comments guys. I was slowly leaning to getting a single 30 inch screen before reading these comments - so now I'm definitely leaning strongly in that direction. I guess I could always get more 30 inch screens years from now (because they are expensive as hell) if I want more than 1 screen.
If anyone does use 3 screens for COD - I'd love to hear from you. Or if you use it in anything else (other flight sims, namely DCS, or racing sims).
-Forged