Everyone will recommend different things now.
I believe Feinn [prob. spelt wrong] are the 'benchmark' to judge by.
I've got this;
http://www.amazon.co.uk/gp/product/B00NC3968E?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
Dose what i need it to do.
Relatively cheap 'n cheerful.
It isn't used heavily so didn't see point in paying for a heavy duty unit.
Main thing is to get one with the more common blade [attachment] fixings.
So when you do run out they are easily sourced again.
The blade quality matters more than the actual driver tool it seems.
Edits to try and offset pedant observations [this will drag 'em in!]