Those are a great choice. I'm partial to Grovers. I've been studying the newer tuners and agree that the Planet waves models can be a problem as they can be overtightened quite easily. There was another set out there; quite expensive; the name escapes me, but had a 40:1 ratio. I think Ed Roman uses them on his mass produced guitars. Anyway they have issues also.
Gotoh, however has as part of their Delta line a nice locking tuner with, I think, 21:1 gear ratio. They seem to have good write ups. I don't care for the design, (I like the schaller / grover hardened steel hard edge look) but they seem to be a great choice. I'll probably get a set myself at some point. I'll get the link, but you can see them at Allparts. Brian may have them in his inventory also. Just make sure they're described as such in a catalog. I believe they're the 510 or 512 series. They are expesive, though.
OK: Brian has them!:
http://www.universaljems.com/cart/tuner3x3lock.htm
Check these Steinbergers if you have the cash to spend. They're a proven design. They're usually put in the tail, but I don't think it'll be a problem installing them in the peghead.
http://www.stewmac.com/shop/Tuners/Guitar,...ess_Tuners.html