I think SuSE was the one to go for, last I heard. Seems a bit pricey at $119, IMHO, but comes with installation support too. Mandrake is another contender, and appears to retail for $100 without support. You can DIY of course (Debian, Gentoo, Fedora), but it's nice to have the CDs and installation help a phone call away.
<i>Knock Knock, Neo</i>