[ubuntu-in] Need a review on AMD64 and supported Graphics Card

[Dhruv]

Hi Guys,
I've been using 6.06 on my AMD Sempron 32 bit box for a long time, I'm
gonna up grade to the amd64 and  would definitely like to buy a graphics
card.
I'd like your opinion on Ubuntu 6.06 for the amd64. Seeing the forums i
got the feeling that most ubuntu software's required work arounds to be
installed on the amd64. Is my opinion right??????
I also want to buy a graphics card, any suggestions for ubuntu
compatible hardware.

Thanks,

Regards

Dhruv