New wheels

[Arthurclode]

Hello everyone. My first post so please bear with me. I would like to have my bike shop build me some custom wheels. I was set on Zipp 303s, but I realized that for the cost, my bike shop could build something that is not seen everyday. Thinking of Chris King R45 hubs, appropriate spokes, such as DT or Sapim. Here's the quandary. I would like carbon clincher rims. What are some options other than purchasing Enve rims? I am not against them, but would like 3 options. About 30-45 mm rims. I am 6 feet tall and 190 lbs. aluminum rims are fine but I already have 3 good wheelsets. Never had carbon wheels. Thank you in advance.