General

Upgrading video card

Hmm here are my specs currently

System Model: GA-770TA-UD3
Processor: AMD Phenom(tm) II X6 1100T Processor (6 CPUs), ~3.3GHz
Memory: 4096MB RAM
Available OS Memory: 3326MB RAM
Graphics card: Xfx Radeon HD 5670 (512mb)

With Antec Earthwatts 500W PSU

In a Antec Sonata III

So here's what im wondering, i know that my cpu is bottlenecked in games by my graphics card, although i can play most games well, i was wondering what cards are available for me to upgrade to.
Games ill be playing will be FPS and Rts mostly. So games like Battlefield bad company 2, Battlefield 3 (when it comes out), Starcraft 2 and Need for speed Shift 2

Budget Under $200 Withought shipping. I live in Canada
Here's some sites
www.ncix.com
www.newegg.ca