Your choice depends a lot on what you actually want to do with the jig, Scott. There are dozens, if not hundreds, of variations on the theme. Some bench-mounted, some designed for router-table use. If you want to use the jig with a hand-held router, I'd suggest looking at both Leigh and Porter Cable. If you have the space, the Porter Cable OmniJig (new, not the old ones found second-hand) is a good choice. The Leigh DR4 is smaller and lighter, but lacks some of the convenient features of the OmniJig.