Amicrawler, I have to step in and say that you're very wrong about "unix" vs linux vs BSD.
Linux can be used as a toy, and is popular in doing so due to it's physical price, but it is by no means is it limited to that. Many large servers are Linux-based due to it's flexibility. Also, many of the up-and-coming supercomputing clusters, notably those developed for the ASCI project, are Linux based.

Also, OpenBSD is not just a server operating system. I have a box at home that I use for my leisure. NetBSD's goal is to run on as many hardware platforms as possible. FreeBSD is the more end-user friendly, in my opinion, due to the fact that it bundles more software and enables more features by default.

by "the pimpin bsd", I'm guessing you mean BSDi...

And OSX is not in itself Unix. It's wrapped around a Unix-derived system named Darwin, but OSX itself is not "Unix".

SD,
The main difference between Redhats Professional and Personal editions, historically, is service, not product. Typically, they will allow you to use RHN (Redhat Network) for updates and provide more phone/email/fax/etc... support if you spend more money.

If you're confident you can get it going, save your money and get Personal. If you want someone to walk you through installation / configuration over the phone, you'l have to pay more.