I finally found a deal on a 6x48/12" sander combo, and now I need to figure out what grit to buy. Is there a grit that is generically better than the rest? I figured that maybe I would buy both in the 80 or 100 grit. I fear that if I get anything higher in grit the belt would just clog up. I know, the answer is "it depends", but I have to start somewhere so I can make an evaluation from there.