I have 4 Sherwood regs, albeit older ones (Magnum and Magnum II) which I think are great. The thing I looked for was ease of maintenance and parts availability. These regs can be serviced almost anywhere in the world, and just about everyone will have the simple service kits, which are relatively cheap.
If you are going to be diving all over the world, this is important. If all your diving and servicing will be done locally, then get a reg that the local shop services/supports.