Mart

My 2 cents / .10 euros ;\)

Your inexpierience with Linux is what could potentially open up a hole in the system. Linux regardless of flavor also needs updates and patching otherwise you may find that someday someone else is now managing your box for you but you might not know because you don't have the experience to fully manage and keep up on top of it.

I would go with an all-in-one solution as well if possible. Not that you could possibly mess something up on one of them as well, but probably less likely.