I love my dremel, works great. I've drilled thousands of holes in tubs and it hasn't burnt out yet.
Heck, just plain ol' electric drills are a great choice as well.
Go with a plug-in, I get frustrated at battery-powered tools.
If you choose a Dremel, just compare prices. I only use a handful of the bits and things that came with my kit, but it was still more affordable to get the kit than buy the individual bits.
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