IMO you want a guy who is involved in the offence, returns punts and returns kickoffs.
Dante Hall is #1 in this category.
A guy you might be able to steal is Wes Welker of the Dolphins.
He returns both and is the 3rd reciever behind Chambers and Booker.
BJ Sams of Baltimore and Darren Sproles(currently injured) of San Diego were good last year.
If your league is IDP Chris Carr of Oaklandon and PacMan Jones of Tenn. are also solid.
Jerome Mathis of Houston was really good last year, but he is out for the first few weeks of the season. Keep an eye on him and snatch him off of waivers when he gets healthy.