I use this one too.80 Piece Rotary Tool Kit - Rotary Tools - Power Tools
This one works great!! Kristi (flipped stars) told me about it and I got one as well.
Annnd it's only 10 bucks, unbelievable!!
Dremel is a excellent tool will give you many many years of service! I have one my dad gave me thats over 20 years old and still works perfect.I use a pet dremel for mine:
Dremel Cordless Pet Nail Grooming Rotary Tool (761-030; 7,000/14,000 RPM): Amazon.co.uk: DIY & Tools
Its brilliant, I even use it for the parrots nails