I like the dremel tool kit, http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100647083&N=10000003+90401+502104
The flexible extension is what i use to frag, it keeps the cutting wheel away from the motor and main collet, if it gets a little sticky, I just lube the coil inside, just pull it out and do it.
Some get the cordless one, but I for one liked the kit, because it came with the grout remover, circle cutter etc....Plus I have a tendency to forget to recharge my cordless tools, so when i need to use them, I pull the trigger and get poof!