SP-CMC-8 (at 943) - smaller, great omni, somewhat tinny cardiod
SP-CMC-4 (at 853) - somewhat larger, great sounding cardiod, omni and subcardiod
SP-CMC-12 (at 350) - I don't know
Personally I'd go with the CMC-4, unless I only needed an omni in which case I'd take the CMC-8. The CMC-4 aren't that big.