Here is a previous post that might answer your question as it's really the same concern:
http://www.yorkietalk.com/forums/yor...-clippers.html 
From past postings, the most recommended clipper I've read and am tempted to purchase for myself also is the Oster Golden A-5 2 speed or variation of that line (for different blade sizes/length, etc).
http://www.yorkietalk.com/forums/yor...d-clipper.html http://www.yorkietalk.com/forums/yor...pers-best.html
Good luck on your choice!