The main thing you'll need to decide is whether to use Apache or some other webserver program. Then, pick your distro depending on that. I've used RedHat, SuSE, and Slackware. If I had my choice, I'd use FreeBSD, which, I know, is not Linux. BSD costs as much as Linux (Free download) , and it's rock solid. However, any of them are good.
Iolair MacWalter