Once you have your production machines replaced w/ macs, You'll have two dells to play with. You should put linux on one of them.
You said this: ^^^^MS and all the PC problems^^^^
You'll quickly find out that it's nothing more than MS and all the MS problems.
Ever since Apple went Intel, they really are nothing more than a PC. Hardware wise they're virtually identical. The biggest difference is the BIOS.
I've played w/ Ubuntu and Mepis. Burned the CDs and used them some.
Never got up the nerve to partition the HD and install them because I read numerous bad outcome stories of folks that tried it.
Since I don't leave my comp. on 24/7 I always had the problem of losing my 'preferences' every time I shut down.
Another problem was the fonts. The rendering IMHO is terrible.
Ubuntu is so pretty on startup but some sites I surf just couldn't give me a readable font.