I have the Hilti PD42, its the top one of the three that Hilti offers. I went with this one because I sometimes need to accurately measure outside, and the model that I have has a sight glass (magnifier?) it will go 200 meters - somewhere over 600 feet.
If I didn't need it outside I would have gone with the less expensive models.
Bosch has a new one out, a buddy of mine ordered it - not sure if it was from ebay or not- he had to get it from England! that model isn't avail. here yet, but from the spec's that I've read its a top end unit. I think it cost him about $260 Canadian. (its prob. cheaper in US funds, guessing 10-20%)