Thanks to everyone so far for the responses, given me a lot more to look at. Currently at work but going through the various links and reading up on some of the the things being posted.
The U28D590D looks very nice. Even though I know my card won't be able to run games @ 4K right now I'm still tempted to get it. 28 " and 4K is hard to deny. I'm going to check out the FG2421 as well. Though pricey, if I'm understanding correctly, it delivers a high quality experience while not straining the current GPU too much. Being able to do 100+ FPS in the future is also quite appealing.
Realistically, what kind of card would someone need to run a game like, say, Far Cry 3 or Watch Dogs on high (not ultra) settings at 4K?
As you haven't mentioned watching TV or movies, you should probably rule out 16:9 screens, as that's the only area where they beat 16:10.
The reason I want to stick to 16:9 is because that's how YouTube videos are formatted. I could run my desktop in another resolution and record games @ 16:9 but I've had issues with this in the past.
Depends a bit on the games you play since different displays have different priorities with lag, resolution, black level, refresh rates, colors, viewing angles etc. There is no one size fits all solution.
I play a wide variety of games due to the nature of the content I make. I enjoy FPS but don't play them a ton and definitely not on a competitive level. I do like other fast paced games though like Devil May Cry, etc.
Viewing angles shouldn't be too critical for me. I'm usually right in front of the monitor so it shouldn't effect me too much.
Thanks again for the feedback. If anyone else has suggestions/questions I'll definitely take 'em, otherwise I'll use this info to continue my research.
EDIT: Missed some replies while I was posting. I'm torn between a larger, good monitor which will strain my current GPU and "force" me to get a new one vs a smaller monitor with very high picture quality. Going to have to think on that one.
As to the new G-Sync monitor, I looked at those and wonder if they are worth the price. Are they really THAT good to justify the $700ish(??) price?