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If you're going to start from rims, I'd go for the Halo Mercury (re-branded Kinlin Nb30), although if I actually wanted a set of ~30mm deep alloy track clinchers, I'd stick with the Mavic Ellipse, they have proven to be very tough and they are much cheaper than AC420s.

I was looking at them for a fast, yet reliable, set of road wheels.
I was actually a bit suprised to find out that the Mercurys where rebranded Nb30s,as I had kinda discounted them as a hipster brand slaps wrist. Easier to source than the IRD Cadence aero too.

I'm now very tempted to go all out and put together a set of light 30+mm carbon tubulars. I have other bikes to use in the rain, and like the idea of having a wheelset for tubs. I can always compliment these with some cheap-as clinchers to cover all the cheap-light-strong bases.

Tempted by these rims.
http://cgi.ebay.com/Pair-Full-Carbon-Road-Bike-700C-Wheel-Rims-38mm_W0QQitemZ370315225999QQcmdZViewItemQQptZCycling_Parts_Accessories?hash=item563881eb8f