New video card

I was looking at these two cards, and im not really sure which to go for:
Asus EN6600/TD256 GeForce PCX-6600 256MB PCI-E w/TV & DVI Retail
Asus EN6600GT/TD128 GeForce PCX-6600GT 128MB PCI-E w/TV & DVI Retail

Whats more worth it a GT ot the 256 meg one?

Thats hard. But I bet in almost all cases the GT will be faster. Only a few upcoming games will take advantage of that much texture memory.

I'd get the GT. I wouldn't bother for PCI Express.