i like a 700c and am finishing a custom build using them. Its a disc brake bike, and the BB is high enough that I could use 26" rims in a pinch (using the existing disc hub), if 700c cannot be found wherever it is that I need one. best of both worlds.
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2009 Custom TI Frame Road Bike, all 2007 Campy Record, Campy Euros Wheelset
2009 Custom TI Frame touring Bike. S&S couplers, XTR Drivetrain. LOW granny.
2009 Performance Bicycles TI (by Lynsky) road frame, 7900 DA, 7950 DA Compact Crank, Light Niobium Rim Wheels