I have one more question. I know I said I wanted a hd6850, but I did some research and it said PCI-E 1.0 was good for older cards. I know the hd6850 will fit, but because it is a pretty fast card, will it be hindered?
No... You may see a few FPS drops but nothing of a hinderage to the card. It will not saturate the bandwidth to the point of causing major performance issues.
Yes, ideally you would want to have it running on a PCIe 2.0 x16 but in the end the difference isn't really enough to purchase a new board... IMO