If you stick with 5 bolt CF, you can probably use either 10 speed or 11 speed Chorus, Record, or SR cranksets. There may be some minor differences, but nothing insurmountable. 110/112 BCD for the compact cranksets.

The compact CF cranksets show up on E-Bay from time to time, sometimes at a bit of a premium over the standard (135 BCD cranksets).

I haven't noted the shims that [MENTION=368670]gfk_velo[/MENTION] mentioned. Perhaps more to explore.