Bang for the buck Ultegra. I had the Dura Ace ones for a while and they were great (sold them with the bike at the time). If funds aren't the issue I'd go for the DA's.
However if you care about a light climbing wheel at your weight I think you're limiting yourself in your choices. I had the Bontrager Race Light's in tubeless, great wheel. The X-lite's are even lighter. Personally I'd look at something like a November Carbon Rail 34, good weight, great profile, I run the Rail 52's as my regular wheel in summer, the 34's have the same nice wide width. my 23mm tires measure 24.6 or thereabouts on them and spin beautifully. The stock Rail's now come with White Industry hubs for around $1300 I believe.
Anyhow, depending on your budget I think you can expand your horizons a bit given your weight and go custom. I do really like Shimano wheels, I think they're incredibly under rated but I think there are more interesting varieties out there for you. JMO