I have this exact bike and have been pondering the same. I used to own some
Vuelta Corsa HD's at Nashbar, and while heavy (2400g), they spun like crazy and were very solid. You can get them for about $150 on sale. Bonktown has some Fulcrum Racing 7's for $175 or so from time to time, but I think your best bet may be to spend a little more and contact Psimet.