Am looking for a Dremel on ebay. Seen five model numbers with varying voltages. Will the cheaper, lower voltage ones be OK? I'm not sure what I'll use it for, just random things that pop up I suppose. I do have to cut a notch in a rear Mudhugger I bought (a flange for a cable on the seat stay is in the way). It's thick plastic. I want the option of doing a bit of metal cutting as well though...you never know. Just wondering if the cheaper ones like the 7750 (4.8v) are a bit weedy...