Wow, that's a nice little budget for wheels!! Well, I think there are 2 camps of thought you can go with on this: don't spend a whole lot on something that may very well get trashed....or, go all out! If it were me....I would get a handbuilt set of Zipp clincher rims (404s), built up with Dura Ace or Record hubs, 24 or 28, 2x in the front, and 3x in the rear (28 or 32).
Rationale: strong, durable wheels that can be rebuilt if necessary, with proven hubs, yet the wheels will be aero because of the rims. As for spoke choices, that would depend on: your weight, expected road surfaces, can you true your own wheels? For example, I am not good at truing wheels and don't have someone nearby I trust, so I would just stick with round spokes. Otherwise, aero spokes....however, a pain in the butt if they get out of true and start turning, effectively becoming paddles in the wind instead of aero. I had this happen with a rear Cosmic Carbon....admittedly after 3 years of hard racing, but still something to consider.