Just for the heck of it, for what it's worth, I have the 9500 GT with 1 GB of ram on board it, runs like a dream for me...no stuttering, no hangups...pretty happy with it, especially the price tag. I haven't had a lot of experience with the AMD Radeon boards, so I can't comment on that myself, but thought I'd offer my experience with the slightly bigger brother to your card.
Good luck with it, hope it runs great for you.
BTW: Make sure your power supply will handle it too...had to put in a larger one for my card.
Jim