I'd choose the 6600GT, it's maybe like $140 and is quite much better than the 6600.
Originally Posted by Mr Krabs
ATI 100-437105 Radeon 9550 256MB 128-bit DDR AGP 4X/8X Video Card - Retail $125.00
SAPPHIRE 100577-GN-F Radeon 9550 256MB 128-bit DDR AGP 4X/8X Video Card - OEM $60.00
The biggest difference is that the other one is Retail and the other one is OEM.
Retail comes with everything u need, including manuals and nice looking boxes etc.
The OEM is just the card, nothing else. I'm pretty sure that the OEM version doesn't even include the heatsink.