I believe you'll love the 980Ti .....should fit well...
 
I'm sure I'll be corrected if wrong..
 

980TI will be great, if you aren't a heavy clocker, then the Classy is largely a waste, go with the FTW.  Side note, 2x 690's is better than any one card right now (out of the box), as that is basically 4x SLI of GTX 680's, as each 690 is 2 680s (or 770s) in SLI.
From my experience (and im not a battlefield/COD fan... so this may be moot) I have had very little issues with 2 single proc cards and in general scales really well, 3 single proc cards scales pretty well, some games it is awesome, others barely any different than 2x.  4 way tends to be stable but does not scale well, and quad (2 dual proc cards) tends to do really well for things like development software (photo editing to scientific applications) that wants to fully use all of the GPUs, benching it does well (4 way does better) and in gaming it can be hit or miss.  Some software loves it, others, not so much. 
A single 980TI, I think will perform comparably, it has MUCH more RAM so you will not see the FPS yoyoing when you bottom out VRAM anymore, but for raw GPU horsepower the 2x 690s will still outperform it.  I think what you will see is a more stable platform without much of a noticed improvement on FPS aside from stability.  Also, it will produce WAY less heat and use far less power.

Sorry but ill never spend a dollar on AMD, but i do appreciate the info.

Id love to not drop $700 for a new gpu as these 690's are amazing just cant catch stable drivers it seems.

I never overclock any of my stuff. I know there are tons of how-to's all over the internet and it isnt rocket science, but Id rather not ruin my cards with a mistake lol.

I think for 1440p 144Hz you would still need 980Ti? 
 
I might be wrong but my 980Ti cannot run ROTTR at constant 60Hz with everything full on.

Is the hybrid 980ti worth the extra $100 price tag? Looking at that for the better temps and look