I'd personally go with windows98Se, or maybe go with a linux platform like Debian, Red Hat, or maybe even Gentoo..
But i would suggest that maybe you might even stick with the operating system you are using at the moment, as it might suit your present needs, or you might not feel comfortable with using a different Operating System.
But what ever you choose in the end, will be the Operating System that best meet's your needs.

nite-
1+1=2