Aerodynamic clincher wheel you say?? Have a good look at the new Renn
575 disc wheel then (currently with tubie and clincher in 700 and 650c
with Shimano splines..and Campy coming for the new year). For $400 you
can't even talk to someone selling a used Corima or Zipp. Bought one
for myself about a month and a half ago...workmanship is very very
good. Having never owned one before I can't readily compare it to
anything else..but ask yourself this..is it worth another almost
thousand dollars to find out the difference wasn't that big? On the
flipside..the post before mine has something that will match your
current set up..can't go wrong there either. Best of luck with
whichever you choose.

cheers
Kent