I didn't read through all the comments above, but I very much recommend getting the 1gb version of the 460. read the article about it the Tom's published a couple days ago, it will shed light on why you'd want to get the 1gb and not 768!!!http://www.tomshardware.com/reviews/geforce-gtx-460-gf104-fermi,2684-9.html
You mean the article that says:
In general, you give up very little performance stepping down to the 768 MB model versus the 1 GB card.
on the page after the one you linked? All the article is showing is that the card's memory isn't suited for 2560x1600 with AA on. The 1gb card is certainly better, especially if you want to SLI or use a very high resolution but the 768mb card is a good value as well.