We only do group ride racing . . . We are running Kinlin XC279 36H rims on CK hubs with CX-Ray spokes. This combination has worked extremely well for us. That said, If you are looking for aero, the spoke count is not nearly as important as wheel/tire section. You want deep wheels the same width as your intended tires. It's a package. If you use aero spokes, the count is not all that important and the least of your issues. Better to use more of a thin spoke. They'll put less force on the rim, both because there's more of them and because of their elasticity, and they'll last a lot longer also due to elasticity. There are some deep and wide alu rims available. A Force is probably the best available right now and it comes in 32H drilling. It's still only 24mm at the brake track so 25mm tires might be a bit too wide, but 24mm tires are available. Otherwise it's carbon. I'm not familiar with carbon rim availability, but I believe there are some offerings with custom drillings.
IMO a few heavy spokes is the wrong way to go for both aero and durability.
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