I had some kind of rails pickup of relatively vintage output (~6K) in the bridge on my Tele. I hated it, because it sounded nothing like a single coil, but at the same time it didn't have the power of a typical humbucker. For me, it was the worst of both worlds. The tech at a guitar shoppe in Green Bay (who is also a frequent contributor to the Fender Forum), likes the GFS rails pups. He doesn't tap them but instead wires a phase switch for the two coils. You get a quasi single-coil sound but it's still hum-canceling.

For my Tele project I've pretty much decided to go with Rio Grande Muy Grandes. However, I'm still toying with the idea of putting the GFS Lil Punchers (the Tele version of the Lil Killers) in it with a coil tap. I'd probably go with the hottest set, mainly because I'm also into metal. Tapped, it would go to a very comfortable 7.5K.