5850 holds best price/performance although the 5870 certainly isnt a bad choice. 470 is actually a decent card for price/performance, but with the 4xx series gpu's they are HOT and consume a considerable amount of more power when compared to the 5 series from ATI. I'm actually in the same situation as you but I've pretty much ruled out the 470 cause I don't want 90 degree air pouring into my room that has no fan and no AC in the summer time, and if anyone sas WELL IT DOESNT RUN AT 90C ALL THE TIME, well yes I would be running it all the time because I would be folding. I thought I had ruled out the 5870 cause it's too pricey but I'm getting some income tax back this year !! :) I probably still might just get a 5850 and get another down the road for xfire, but it seems it's pretty hard to find a 5850 for a decent price right now. If I have to pay over $320-330 for a 5850 I might as well just get a 5870 for around $400, which seem to be easier to find as well. I'm running my monitor at 1920x1200, so even a 5850 would play any game smoothly at the resolution your monitor runs at (1680x1050).
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