Is a 6600GT card the only good option for me ?

I now have Athlon 64 3200+ with 1 Gb RAM and a Radeon 9800 Pro AGP 128M and a Asus A8V Deluxe MB.I have been given the advice to get a new graphics card and also that the only best alternative would be a NVIDIA 6600GT (well unless I wan't to spend much more money) card because of the GDDR3 memory. A card that to me seems to be alternative is aSapphire Radeon X1600PRO 256MB DDRII, AGP8X, Tv-Out, DVI-I, Lite-Retailthis since one customer review stated does he thinks it's better than 6600GT. Also it's cheaper (about $65). What do you say? Is 6600Gt defenitely better than a Radeon X1600PRO. And if so does it matter which 6600GT I buy?