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.
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.