for starters get what was offered and save for another one to do crossfire. Or spend more now and go for the HD 6950 or the GTX 560 ti.
They are both about the same leaving the 6950 a tad faster. But prices depending on what brand and OC or not.
It is about 50.00 dollars more than what your budget is. Everything on your specs will handle them just fine. Just food for thought and Good luck