Well I've just moved to Linux in late March. And I'm still a newbie
Switched only on my laptop. Not like 150 computers which you intend to do.
However. Done a little reading about different distros. I've been a Windows user for the last 17 years, so I'm not used to the terminal screen and compiling stuff. I was looking for a distro that:
A. Could do (nearly) everything in a graphical user interface.
B. Similar to Windows in usage.
C. And don't have the need to compile a lot of stuff yourself.
D. Ability to listen to music, and watch movies without much of a fuss.
E. Since I use my laptop as my daily computer. I wanted it to be a stable and solid affair.
I've decided to try Mint first. And that one has been running ever since. Using it with KDE. It fits the 5 criteria I've set for myself. It was very easy to install. And moving data over from my external hard disks wasn't a problem either. It's faster than Windows 7 ran. Software Manager makes installing software a breeze. So I'm happy
From what I've read. Late May Mint should release version 13
Currently I'm using version 12 which is supported to April next year.