The Aussie dollar is about 76 US cents. I dont know where you got that 2x crap. And read his choices first before you make reccomendations. He never mentioned an x850xt. I didnt even know the 7600gt had been released here in Aus. personaly, I would choose the GTO in the hopes of unlocking.
I would go with the GTO too, since I have it . But dont go for it just coz it can be unlocked, since the chances that the unlocked pipelines will fail is fairly high. Most GTOs are just x800xts that have faulty pipes so they disable the faulty ones and sell it as a cheaper model. However, ATI cant bank on too many dodgy cards, so some will have disabled piper that work perfectly fine, and may even overclock well too. Just dont count on it.
EDIT: That GTO is expensive, I got mine for around $AU160, excluding postage. Glad I live in Sydney :wink:
Yeah they have the 7600gt at netplus. One thing I am a bit iffy about is whether or not any of these cards will represent a significant increase in performance over the 6600gt or if the money will be better saved for the new pc.
I think it depends on what resolution he games at and how happy he is gaming on the 6600GT. I'd take a X800GTO over the 7600GS, but really unless he is willing to spend the money on the 7600GT, I'm not so sure I'd upgrade unless the 6600GT truely isn't cutting it at the settings he wants to game at. Your prices are high and the 7800GS isn't all that bad priced compared to the 7600GT. It's a bigger difference in the USA, making the 7600GT a clear better buy IMO.
Anyway, look over the digit-life charts and the games/resolution/settings that matter most to him. Those charts are PCI-e, but except for the 6800GS(PCI-e clocked higher), things will translate the same in AGP. The 6600GT, 7600GS, X800GTO and 7600GT are all in those charts. The 7800GS would be a bit above the 7600GT but obviously always below the 7800GT. 1024x768 no fsaa the 6600GT will do pretty good. But 1280x1024 4xaa/16xaf, the 7600GT will show a big lead. http://www.digit-life.com/articles2/digest3d/index.html