DT Swiss makes a deep rim, most people use it in cyclocross that I've seen. It's also 30mm deep, same as the Velocity Deep V's, but the rim itself is much nicer and stronger. Miche makes a relatively inexpensive wheelset now with deep rims laced to (surprise) Miche hubs, it's called the Pistard.
I went with CXP33's, thinking the "33" referred to how deep the rim was, so the CXP22's were "22mm" deep - apparently that would make too much sense for Mavic though, and that's not how their numbering works.
I also would recommend the A/C Track wheels if you can find them cheap.
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