I vote for the 85 Combat.
I just sent my 85 combat to David at cajun gun works. I had his #3 hammer kit installed along with the ultra lite spring kit, then I pulled out all the stops and had it turned into a SAO with the CZ flat SAO trigger. I am planning on doing a whole write up about it after I get more trigger time. I have owned a XDM-9 and i sold it off. didn't like it at all. I bought a CZ 75 shadow target, i liked it so much I sold off all my HKs and bought an 85 combat, and some other goodies.
Aaron