We use this one
http://www.grizzly.com/products/Keyw...9-pc-HSS/G9771 to great success, but you have to be careful not to break the broaches with an offset press. Bending = bad!
The good news is that overall they're quite easy to use. This set goes up to 1/2" diameter holes, which is as big as we've ever needed. We were given a set for even larger holes and have never used it!