I am buying a VPS from my host and they are offering me the following distro's:

CentOS 5.5
CentOS 5.4 w/ Kloxo
CentOS 5.4 w/ cPanel
Ubuntu 10.04
OpenSuse 11.1
Slackware 13
Debian 5
Fedora 12

What I Plan to Do?

I plan to have multiple sites about 15 of them to be exact, running off a VPS. I also wish to install a RTMP:// (FMS) on it.

I want these sites to be about 15,000 guests per/day maximum, I will be streaming to the RTMP server from Flash Media Encoder, and having it stream to some of my websites so users can watch.

I don't know what web control panel to use, because cPanel is expensive, and it's the only one I've been exposed to, so if you could recommend a control panel also, that would be awesome.

I hope this is enough information to help me get the best distro recommendation.

Thank you!

Whatever you are most familiar with.

Failing that, Ubuntu or CentOS.