550 Ti vs 650?

Hello. I am planning some PC upgrades in the very near future, and I was wondering, would a 550 Ti or 650 be better to run Battlefield 3 at 1440x900?

650 FTW

So, the 650 is better? How much better is it?

http://www.anandtech.com/bench/Product/541?vs=681

http://www.anandtech.com/bench/Product/541?vs=680

650 Ti cost 20 bucks more

I was looking at a regular 650, not Ti. The Ti 650 is like 50 bucks more than the regular.

Okay, I've settled on a 650 Ti. How much of a bottleneck with a PCIe x16 1.0 slot be on it?