http://www.amazon.com/gp/product/B017ILDZCI?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00

There is a reviewer named Benson Leung -- that went in depth. So much depth--i eventually just nodded and purchased the one on his list with the highest stars. Gotta love people with a passion for what they do. :)