In that price range I think just a better sander is your best bet. I have a Dewalt random orbital. The one with speed control. It's definitely not as vibrational as some cheap ones, and it doesn't give me too many problems, as I've got arthritis in my joints, specially my hands.
Side note, I do have the bigger festool sander and it's a game changer for larger projects. I used it to take down a pop corn ceiling and it was awesome.