Hemsedal is definitely your best choice. It has one of the best ski resorts in Norway (way better than Geilo), and good mountains to do off piste skiing off. Moreover it is well known for ice climbing.
I dont know any guides in Hemsedal, but Thomas Carlstrøm at the sport shop "skandinavisk høyfjellsutstyr" may be able to help you. The phone number is +47 32 09 00 67.