I have absolutely no complaints about Leadtek. I have the card in the sig and first one went belly up after two months, checkerboard. RMA process via email was exceptional. Second card works beautifully.
If you need AGP and can swing ~$200 I think most people would suggest the vanilla 6800. PCIe is still pricey (~$300) for them. If PCIe is what you're going for the 6600GT is a good card for the price.
First of all a 6600GT is a awesome card and leadtek is a top company, together they are a awesome team, by cousin is using a leadtek 6800GT and its great but i prefer gigabyte