I recommend the Targus universal AC adapter
. Note that it is a 90W model, which will power laptops with integrated graphics (normally requiring 65W) as well as those with discrete graphics (normally requiring 90W). However there are some high-end workstation type laptops such as the ThinkPad W-Series
, which require 135W or even 170W power adapters. No universal type adapter I know of will supply more than 90W. Scott.