Adam, would the Sears ones be good enough for polishing after wet sanding? I've heard good reviews about the Porter Cable 7424 but it costs $130 ... quite a bit more than the Craftsman ones.
I dont think any orbital is going to be good enough to polish after wet anding. Your going to need an high speed buffer for that. I have a Dewalt and a Makita for that. Both are in the $300 range.