"ATI 7850 2GB DDR5 XFX" for gaming on 29" monitor with 2560 x 1080 resolution

It should last for a few years seeing as you have a strong CPU. When it does begin to lose frames just add another and you'll be fine

My advice would be to back off the i7 to a i5 4670k and drop the extra 100$ into a better GPU. The 7850 will play at that resolution, but not high settings.7950/7970, R9 270/280 or Nvidia 760/770 would be my suggestion

EDIT: And if you ever plan on running two cards I'd up the PSU to atleast a 750W, preferably a 850. I would also go with Corsair, XFX, or Seasonic

U def need a better gpu for that.

@mnc221, @fatboytyler, @WarWolverineWarrior - Thanks for your responses.

@WarWolverineWarrior (or anyone) - any reason why a better gpu is needed. What are anticipated issues with 7850? Will it not fill my 29" screen with 2560 x 1080 resolution?

@fatboytyler - Sorry, I am naive as far as gaming is concerned. What do you mean that the 7850 will play at that resolution, "but not with high settings"?

Thanks for pre-empting PSU point. I had that question. You have anwered it without me asking it - you are an expert!

@mnc221 - Your comment is quite comforting for me. I would be ok if it runs fine for next 3-4 years and then I put another GPU in crossfire.

I have never played games I have mentioned. My primary purpose for PC is not gaming. I need lightning speed experience with MS office work, general Windows 8 maneuvering, browsing, photos, movies etc. Gaming is important but not as high as other things I have just mentioned.

You have a mid lvl card I think it will be perfect for what you intend to do.

The 7850 will simply not be powerful enough to handle the high end settings (High and Ultra/Max) with upcoming titles. However at lower settings such as Medium and Low it should do fine, even with upcoming titles. 2560 x 1080 is a fairly taxing resolution. I apparently misread your original post. Since you are not an intense gamer you should be fine. If you could up your budget to include a 7950 I would highly recommend it. You can usually find them for $200 or less nowadays.

You also have above HD monitor

the 7850 can handle new games at 1920x1080p at medium-high details. at 2560x1080, it will be a struggle with newer/more demanding games like bf3/4, crysis 2/3, farcry 3 etc. I felt that a single gtx660 was struggling with those newer games at 1080p, which is slightly faster than a 7850, so i got a second one. i would suggest no lower than a 7970 3gb or gtx770 4gb, as that resolution will eat up 2gb vram on newer games and run like crap.

7950 runs for about $200 and it's a beast