If you are new to UNIX like me then probably the best would be Mandrake 8.1 (or something close to it) they released a beta 8.2, but I have'nt been keeping up with how good or bad it is. 8.0 and < have great hardware support and it is pretty easy to install. Just go with expert install, there are only a few more options, but they give you better control on how the system is set up. I would choose a journeled file system so that if your computer has to reboot with out being shut down, it won't take forever to check the file system.
Good luck with it.
Will