If price isn't an option Swaro EL's (to my eye's). Lieca's are nice and the Geovid model has the built in range finder whichwould behandy for hunting in open terrain where shots vary, though their lifetime warranty isn't transferable like Swaro and Zeiss.
If the upper level isn't what he really wants to spend then have him take aboo at the Minox HG's.While they aren't quite up to the big 3's, they do offer a very nice view for the dollar.
Call or Email Doug at
http://www.cameralandny.com/.