For that budget, definitely talk to a wheel builder, give them your specific requirements and details and see what they suggest. In fact, talk to a few just in case.
I got mavic open pro on ultegra hubs from Harry rowland 3 years ago..... My weight has dropped but it was 107kg.... 36 spokes.... As true today as when delivered.
He has a very well deserved reputation. If I have any criticism of him is that he is reactant to build wheels that aren't based on the Mavic Open Pro rims. Lots of people have their own preferences when it comes to rims, I prefer to build on H Plus Son Archetype.