You may want to look at Soul 2.0 (1330gr 450$) if you want a clincher, or boyd 24mm (1072gr 875$) or 38mm(1204gr 875$) carbon tubulars.

Theses are good options, but there are lots of other. If you really do a lot of climbing, saving 700gr or 800gr will make a difference. If you change for a 1700-1800gr wheels, you probably won't notice it much. You may also look for aero wheels too...

Also, never forget that climbing will NEVER be easy whatever your bike or wheels are.