Just a note: They will only send the 6.06 LTS version, not the latest 6.10.
LTS = Long Term Support.
I thought LTS stood for
Linux
Terminal
Server
Anyways, Linux is a great OS, but like many you may fall under the whole I don't care to learn to use something different category. I use Linux at home, and at work. It is on my laptop and desktop at work and is my main used OS. I am running OpenSuSE 10.1 and just put 10.2 on my laptop. Ubuntu is okay, but its not like its the greatest. I would suggest suse because of the YAST2 management modules in the OS. This allows for system administration to be a bit more easy. Plus, you can still run everything from the command line classically as well. So, you will get to learn the best of both worlds. Things like apt and YUM can be installed on SuSE. I should know I use them both on my suse box all the time. The main thing is, it is different and it has a higher learning curve, and a lot of linux man pages suck, they assume you already know a lot about that function of linux. Other man pages are awesome and any novice can read through them and learn.
I say download a bunch of different distros and use their Live CD/DVDs and boot from them and play around with them. Personally, I am a KDE man myself, and others like GNOME. Use both enviroments and see which is best for you.
Just recently at work I set up a Linux DRBL server for imaging clients over the network. Its completely free and open source and images windows clients with out a hitch, and it does it pretty damn reliable.
oh and also, I really like debian distros, but i am not a huge fan of systems using the /etc/sudoers for root authentication. I mean I see the point of it, but I would rather have the admin group and root group seperate, just my preference though.