A GTX 550Ti would be a big step up from a 210 and the Corsair will handle things fine.
If you can get a few more dollars this video card is going to have a slight edge over the 550Ti due to the 256 bit video bus. HIS H679F1GD Radeon HD 6790 1GB 256-bit GDDR5 PCI Express 2.1 x16
This might give you an idea of what a 550Ti will do in BF3. Look at the GTX 460 benchmarks as they more closely approximate a 550Ti in this case.http://www.tomshardware.com/reviews/battlefield-3-graphics-performance,3063-3.html