If not those, I heard the Mavics have soem good lower end wheels that are very stout. Like the CPX22's with heavy gauge spokes. they are heavier, about 1-kilo, but pretty tough from what I hear.
You could try the A-class, I have heard they are decent. If they don't work out, at least they aren't a real big investment, and there are options out there.

Here's one. I hear these are pretty tough wheels too.

http://www.nashbar.com/profile_morei...u=12511&brand=

Have you thought of maybe trying a slightly heavier set of cyclo-cross wheels with 700x28's instead? Then you could just upgrade to the lighter wheels with 700x23's later. Just an option.