I'll be playing at 1680x1050 (is that what you mean by 16x10?) on the lcd listed above. Do you think that merits a 4890?
I also checked out that 4890 you listed and it appears it has a consistent issue with hard-boots for people. A 55% approval customer review rating is pretty terrible. I know sapphire is a good company, what happened lol?
^ Hehehe, who would want the same PC for 5 years in a row and not make any upgrades.
Even if someone like me who uses their PC mainly for Music and Movies, there are still better Speakers and Soundcards to buy hehe! I buy my music because it sounds so much better and I like having piles of CD's, I also have 400+ Purchased songs and over 40 movies on itunes =]
Back to the topic - If you have a few hundred bucks left, and you are a hardcore gamer. I suggest you drop the 4870 and go with 2 4890's, to be more futureproof I guess. ( like the guy above me mentioned ) , However if you Love music ( like me ) then i am going to recommend the Asus Xonar Dx soundcard with your extra money lol!
And also a good pair of headphones, I currently use the Denon Ah-D1001 ( very portable ), however if your more of a home listener I would recommend the Ah-D2000's, double the price of the 1001 but very well worth it =]
Denon ah-d1001 - 159$ US, d2000 - 359$ US ( from the site )
5 years works for me, I NEVER upgrade parts. I build a solid computer from scratch about every 3 years and then hand the old one down to family members, NAS, back-up workstation etc.
I see no point in upgrading "parts", I think it's just a waste of money and time. All the parts and speeds are somewhat in sync if you buy all at once. Otherwise, throwing new parts in an old system get bottleknecked and you don't realize the true benefits.