First off, let me say congratulations for coming into the club
Ok, so here's my very biased suggestion on screens (since they are what I use):
Go w/ 3x Crossover 27Q LED (for example, but not limited to
http://www.ebay.com/itm/New-CROSSOVER-2 ... 1c258965ec)
They are 2560x1440, amazing, and they have VESA mount for ease of install. I originally got one, and liked it so much i got 2x more!
Second, for video card, do not, i repeat, DO NOT get a vid card w/ less than 3bg of vram!!!!!! A 690GTX will NOT handle 3 of these due to 2gb of ram. I cannot stress this enough, you need 3gb+ of RAM, and 4gb+ would prob be preferable. I currently run 2x EVGA 670GTX 4GB FTW in SLI. I got these on release, so I didn't have a choice of Titan. The good thing about Titan is that its only 1 gpu, so you don't have to worry about SLI issues. It looks like Titan should be comparable if not faster than my 2x 670 (which i can play most things on max/high), so you'd probably be good. Only thing is you'd need to get a DP -> DL-DVI plug/adapter, which may be an issue.
Anyways, just some food for thought. Good luck on the build! I am currently looking at perhaps getting one of the WSGF stands, as they look a bit sturdier than my current ones. Although its obviously at a premium: $400 vs $90.