ok i have put in the ST165 calipers(they are the same as the ST185 calipers). I use bendix metal kings pads with standard rotors(for now that is).
I have only once had a problem that required more braking, but that was coming down from about 160 on a long drive so the brakes were very hot. This will be over come once i put my mags back on that will allow better air flow and get some cross drilled and slotted rotors, and if i want to go all out get some silicon based brake fluid(has a higher boiling point).
About all that i can do to upgrade the braking once i put in some new rotors would be larger brakes, but i find that for normal conditions the ST165 calipers with a good set of pads will be more than enuff. Give SSS a call, thats where i got my calipers.