I've used the schallers and PW that Warmoth sells and also some too-expensive Gotoh ones from Stew mac. I'd say they are all pretty good, a lot depends on how you want it to look. I actually don't really care for the string-cutting mechanism, it cut off a b string once and then the string slipped out of the hole, and no way could I get it back in there with no play on it. Had to break open a new pack of strings. It takes about 20 seconds to cut off your string ends with snippers.
Schaller: simple and good but heavy
PW: works well overall, black / chrome can be ugly on some builds.
Gotoh 510 mini-locking: http://www.stewmac.com/shop/Tuners/Guitar,_solid_peghead_tuners/Gotoh_Mini_510_Locking_Tuners.html
Works as advertised, looks clean and vintagey, no thumbscrew, but the locking mechanism makes it a bit fiddly to get the string in the hole. Expensive.
If you're getting a locking nut, there's no need for locking tuners. Get the Gotoh sg 38 warmoth sells - cheap, high quality, good looking, simple.