Going to install lunix, what distrbution should I get.
RedHat is the easiest to set up and run. I re-installed with Redhat 7.1 last weekend and was really impressed -- it found my video card and monitor and correctly identified them, detected my CD-RW as such and wanted to install itself with the ide-scsi flag for hdb (my drive), made it easy to install to a RAID-1 configuration, etc.
Basically, Redhat lets you get up and running with a minimum of fuss.
Now, as to which is the best? That's a personal decision.
I like FreeBSD (even though it's not Linux) -- it just seems like a cleaner OS, and the ports collection is pretty slick. You can make good arguments for Debian (not dependent on a particular corporation, so will live as long as developers choose to contribute to it), especially with apt-get (allows you to download newer versions of installed programs automagically from a command line, or even upgrade your distribution rather than re-installing). Others prefer Slackware.
In the end, though, it looks like Redhat has their act together enough that they'll be the dominant player for the near future. They've developed a reasonably well-respected certification process, they've brought in some major players (IBM, Oracle, SAP) which has increased the legitimacy of the platform, and they seem to be the target of new applications -- if you're going to promise compatability with one distribution, it'll probably be Redhat.
That's not to say that Redhat is without problems -- I think the reason they've developed redhat.net instead of an apt-like system is because they need to make a profit (and people are probably willing to pay for upgrades), but overall they've been a positive force in the community (witness the growth of Gnome after they endorsed it and paid developers to work on it full-time, and their willingness to release everything under the GPL).
At the end of the day, if a client asks me "which distribution," I recommend Redhat. YMMV.