The best DVD software I've found yet is the ATI player, it just WORKS. I haven't had to do anything complex like 5.1 audio or anything like that, but I've had zero trouble with it, which is more than ...
I'm currently using an ATI Radeon 64 DDR VIVO (retail) and I've been very happy with it until recently. I initially had problems with ATI's DVD software but ignored it because I had to reformat anyway ...