OP, you are talking about some really high-end, ultra-weight weenie wheelsets/rims. I think you would be better served posting this question on the weight weenies form - weightweenies.starbike.com/forum. They will have a lot more info for you and a lot more people who have actually used those products.

You might also want to put in a call to Fairwheel Bikes out in Arizona - fairwheelbikes.com. They specialize in weight weenie parts and are very helpful. I have a wheelset built by their current in-house wheelbuilder and it has been solid for four and half years now.

All that said, Reynolds, Madfiber and AX all have solid reputations.