Hi Honesty,
Excellight every time
I am a pro mechanic running my own show, I also wheelbuild and have done about 120 this year so far. My default hub/spoke/rim choice for anyone running narrow road rubber and wanting the lightest/strongest possible set up gets zenith hubs 28 (32 if you want total peace of mind are a heavier rider) front, these have 2 cartridge bearings, 32 rear, these have 4 cartridge bearings shim or campy compatible, laced with ACI double butted stainless steel onto Ambrossio Excellight. Doesnt matter if your audax, training, fast road these hoops fit the bill. If I go down in the spec hierarchy its not the rims but hubs, shim 105, that i change. If you go up the hierarchy you are going into more esoteric flat blade straight pull spokes that few of my kind want to build, speed, weight, acceleration gains are very marginal and somewhat elusive anyway. For example, Schwalbe rim tape is about 5g lighter than velox, that counts to some!
Ambrossio rims are also still made in Italy, thats got to count for something in cycling heritage terms.
Open Pro still a good choice and it gets you Mavic stickers.
Your consumer preferences and experience with past kit choice will play a part here!
Happy to advise further
Dave
www.davesbikeshed.co.uk