We just received our Turnigy thrust stand; here's a quick look at this new product from Hobbyking... Takes a lot of the guess work out of determining the best prop for thrust, the most efficient prop, etc.
Make sure you buy a watt meter to go with it!
Product Page:
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=66623&aff=1371488