It's basically my mentality that plays its role. I know GTS250 is the mightly old horse 8800GT in a new shiny armor, and I know HD4850 is AMD's new GPU core. If I were to choose which one, I will choose HD4850 just as I'd choose PhII cpu over outdated Core 2 CPU. Well, that's my thought on it. P.S. I have a HD4850 coming to replace my old 8800GTS 320mb.