if you want to future-proof yourself, you want a 7800 or 7900 honestly. they both have double the pixel pipelines over the 7600. on top of that, the 7900 has even better clock speeds than the 7600. i would say that the 7900gtx will stay competitive longer.
on the other hand, the x1900xtx also has an impressive showing to say the least, and i think its a little cheaper than the 7900. its obviously slightly different in performance, but it at least matches the 7900gtx in general performance.
what i would suggest doing is looking at the games you want to be able to play. if they are heavy in to textures like halo or is an openGL game like doom3, go nvidia because they hold strong there. if the games you are looking at are heavy in to shaders like in fear, then ati is the way to go right now. most new games are shifting away from textures because they take up a lot of bandwidth and arent that flexible anymore. shaders are much more versatile and are basically code, so it executes better and uses comparatively less bandwidth.
also, take a look at some prices. the 7900 and x1900 series are new and expensive... perhaps out of your range. if you move down to the 7800 and x1800 level, those cards are more affordable and the same performance rules apply. nvidia still has good texture and openGL performance, and ati still does good with shaders. you just wont have the newest and best hardware.
to boil this down to something a little less confusing:
-for really good performance, go 7900 or x1900, preferably x1900 right now
-to stick with the $300 budget, go 7800 or x1800, preferably x1800
-if you really want sli instead of crossfire, then your choices are restricted to the 7900 or 7800
i cant give any recommendations on what brand to check right now, but i can look into that tomorrow. im really tired right now and i dont feel like doing any more research today. just let me know if you want any brand opinions... ill check back here tomorrow and give you some more info if you need it.



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