well i've never tried 64 bit, however i did use SuSE 10 not that long ago and like you want to switched to ubuntu.
my main reasons for this:
1) i prefur gnome and Suse has shi...ahem, bad gnome support
2) rpm sux, Ubuntu is based on debian and has a huge package selection
3) on suse i experianced WAY to many reliability problems
4) what can i say? i tried ubuntu and it just felt like home
but if your looking for perfect multimedia support out of the box, Ubuntu (and most other *nix distros) wont give it to you. Ubuntu is a 100% foss OS. Which means many non foss software is not included. But ubuntu has the next best thing. There is a program called
Automatrix that will automaticly configure your ubuntu breezy system for almost everything you can that you can think of. At least dual boot with ubuntu and suse for a while (they can share the same /home and swap partitions). Thats what i did and i just found myself booting into ubuntu more and more, eventualy i un-installed suse and windows.
PS: at least try the live cd a try
hope you enjoy ubuntu, pengu