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@Steerpike
CXP 33. I race on them, they are excellent hoops. Build with DT Revolution spokes for the front wheel, and use less spokes. You can do the front wheel radial if you like. They aren't seriously aero, but don't handle badly in a crosswind either. Don't let the tyres get soft- these rims will crush easily if they bottom out, that's the price of lightweight clincher rims.
If you want a lightweight rim, just for hillclimbs, go for a tubular. That's the only way you'll save serious weight. Ambrosio Chrono rims. If you want a slightly more comfortable ride, the open Pro is the best choice, but the weight saving over the CXP 33 is insignificant.
Have fun!
PS if you choose to use alloy nips make sure the spokes are long enough. They must reach right through the nip.