Which Distro is Best

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I currently have an extra machine that I would like to make into a server. It is a Celeron 2.7 ghz with 768mb of RAM and a 10gb hard drive. I would like to set it up as a remote server(?) so that I can use PUTTY to access it. as well as having it as an FTP server so I can store some files on it. So I am wondering, what distro of Linux would be best? I mostly want it to be fast but I don't want to spend too much time setting it up. Thanks!

[Ravenfrost]

If you're looking for something easy to setup, I'd go with a Debian based distro like Ubuntu or something. That's where I set up my first srcds server.