I bought one of these last week - http://www.lowes.com/lowes/lkn?actio...7KL&lpage=none It will do exactly what you want - it's variable speed control is very good - and it's pretty small/well balanced. It works just like a drill and the hammering motion doesn't kick in until torque starts to build up.... driving screws or drilling pilot holes it's hard to ask anything better!