
Well if you must go with Linux, I'd recommend FedoraCore. It's a continuation of RedHat, but for non-commercial use. The user-base is very large and the update cycle is good. I also like their distribution scheme and option to download and install your upgrades.

But my recommendation for advanced users is and always be FreeBSD. Unparalleled security and stablility (from the original UNIX days this has been proven kernel for such a long time). Plus it's a better philosophy about licensing and such.