I was in the same type of situation that you are in a few weeks ago. I did some research and someone correct me if im wrong , but the GeForce Ti based cards are really the best bang for your buck when it comes to great video cards for the BP6. I just bought a brand new retail BFG Nvidia 4200 Ti from www.compuplus.com for 59.00 less shipping. It has 128 MB Ram and TV/DVI Out. I recieved really good service and fast shipping from copmuplus too. Did I mention the card overclocks close to 4600 Ti speeds with stock cooling 100% rock solid? heheheh
Anyways one of the best reasons to go with the Nvidia cards is that there drivers fully support SMP , ATI Cards (Im actually a ATI Fan) will work on a SMP system but dont support it through drivers. In Quake III Arena with r_smp 0 I get about 65 FPS Timedemo , With r_smp 1 I get about 90

Awesome card , Awesome Price , Awesome reseller. Do yourself a favor and get yourself one ASAP! Take Care
Zachary