I think what you are asking is "what distro is suitable for using as a server host"
Generally GNU/Linux is able to handle services fine in equal measures. Overall, say Apache is configured the same on any GNU/Linux system. Same with postfix, mysql and so forth.
So the question arises of what distro has good package support and such. I have found that Slackware does everything i want it to do, it updates well, and there is excellent support.
MDK doesn't update well, but has good package support.
FC is a pain in the arse
SuSE is very decent
debian is excellent and very reliable but sometimes has ... quirks.
Gentoo is very fast, but doesn't always emerge packages well, I've had issues with PHP ones in particular, but overall i am very happy with Gentoo for my laptop ... so there.
One final thing is: if you are new to GNU/Linux you might not want to administer servers ... But hey you have to learn somehow so read the documentation (admins should also do that so i'm not picking on you
Good luck, let us know how you go