How much Power should I plan for?

[Bushice]

I'm in the process of planning the studio layout, and when I looked at the main electric panel, I noted that there was only one circuit not being used by anything else, and no room for any additional ones.

It brought up the question: How much power do I need? I won't be running a huge studio, there will only be two rooms totalling about 350 square feet with two computer systems and all of the standard recording studio gear, but how much power do I need to plan for, and how best to distribute it?

I know a lot of you have done this beofre, so any input would be helpful.

Bushice