sander question

Hey, I have always done bodywork by hand just with sandpaper(I'm only 15 so I havn't dont alot but still.) But I was just wondering whats a good sander for bodywork? I don't have a aircompresor so I would need a electric one. My friend has a orbital and it works pretty good but what do you guys think, thanks in advance.

Just get an angle grinder...

A D.A. or dual action sander would be the best sander for the job, and they are reasonably cheap.