If your still looking for a controller I am into G scale and know that one of the best (in my opinion) and most widely used systems out there is the Crest Electronics Train Engineer revolution. You can set up 50 locomotives on the same transmitter and the most recent version comes with sound built in. The starter kit is a little spendy but just the receivers are't as bad. Here is a link to the starter set where I get all my g scale stuff
http://rldhobbies.com/cre57000.aspx