How about a CZ 2075 RAMI? Comes in steel and poly. Internal rail design will keep the bore axis lower which will help with recoil as well as make shots more accurate in theory.
EDIT: I shoot HK, but am familiar with the CZ platform as well as firearms based on the CZ. The HK trigger will have a pretty crappy double action. It feels like 15 pounds, but that's probably exaggerating. The beauty about HK, aside from reliability, is that you can swap trigger control groups. You can convert from DA/SA, to DAO, to LEM and back and forth. Most HKs you will encounter at various LGSs are DA/SA unless someone had the firearm special ordered or converted the firearm to LEM themselve. My HK is an LEM (law enforcement modification) trigger configuration, which basically makes it a double action only firearm but with the trigger reset AND trigger pull weight of a single action, which is to say 4.5 pounds for me.
My bro shoots an M&P Pro and has nothing but good things to say about it. I've shot his firearm several times. IMO, it feels the best out of all the striker fired handguns I've tried (Glocks, XDs, M&Ps). The only firearm that probably feels better and has a better trigger is the Walther PPQ, but I have not been able to handle/fire one.
CZs are awesome. They will have the best out of the box trigger at least in my experience.
Of all the three, which do I prefer? HK because of LEM for polymer. For full steel, either a CZ or a Sphinx which you cannot find on this side of the pond as easily.
Last EDIT: I have fired Sigs, but not that particular one you listed. Great firearms with great triggers. I just hate the aluminum frames. Either full steel frame for me or polymer, but I strongly prefer an all steel framed.