I just had the choice to go with the 4780 or the 260.. I got my card like 3 days ago.. I had a very hard time choosing.. and I put multiple threads here and in other places for peoples opinions. I got a lot of mixed reviews from everyone, I think I read every single review for the 4000 series vs the 200 series I could find online.. and then some. it was a hard choice..and to be honest.. the 4870 was almost what I got, but I looked at it this way, I already have Nvidia on my system, thats only a smalllll part. The cards IMHO are basically neck and neck, ya the 4870 wins a lot of reviews, same does the 260. They are even, they both trade off with how many wins, and in what situation. and now with the 260 bein the SAME price.. it makes it just slightly a better choice IMO. Here's what did it for me, I already have Nvidia on system, Nvidia has better company's carryin the cards. the only company on ATI with lifetime warranty.. the only one is Visiontek.. On Nvidia XFX has a double lifetime, BFG has lifetime, and overnight next day card replacement guarantee (and they hold to it). and then eVGA. they have lifetime warranty, and even better. is eVGA has the 90 day step up program. all you do is pay the difference on a new card.. you might as well get the 260 now. and then you can upgrade to the better 55nm cards when they come out. These details here are what Won me over to the green side, not to mention that XFX, BFG, and eVGA all 3 recommend adding 3rd party coolers for better performance and they agree with overclocking. so if you change the cooler, take apart and add different thermal paste, or OC and burn it up. those 3 brands will cover ya.. they are for the real enthusiasts. ATI is more for business (don't be offeneded anyone with an ATI card). so these all together make it a pretty easy choice, plus the cards cost the same now. so I got the eVGA 260. and depending on price and performance I'm going to use my 90 day step up here in 1 month when the new 55nm GTX 200 cards drop..
Sorry this was so long, but I had to get the facts in there.. Question more gooder (good name). What size is your monitor(s).??
oh and as John or whoever said, Nvidia's drivers slowly improve performance. ATI just have drivers.. Nvidia makes improvements.. and Nvidia cards can and usually always OC better. for the exception of a few..