Velocity Dyads or Aeroheads will work great. So will Mavic MA-3s, A719s, and Sun CR-18s or RhynoLites(The RhynoLite is a very wide 700c/29er rim; good for running 700 x 32 and up)
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"I feel like my world was classier before I found cyclocross."
- Mandi M.