Videocard suggestion! ( and a dumb question )

[b1ackic3]

In 10 days I will buy a new videocard.

So far I was thinking either 660 TI to save up some money.
Or 670 , but is it worth the extra money?

Also a dumb question, how well would a GTX 650 TI compete with the 660 ti/670 , because that could become an option as well.

 

[b1ackic3]

Ah nevermind I read they don't come with SLi support.