I love my CZ75, although I went for the DA/SA with safety variant (I prefer carrying cocked-and-locked, as I have no use for trigger pulls over five pounds.) It's big, heavy, quite accurate (I get offhand four-inch groups at fifty feet, and I don't practice with it nearly enough), very reliable, and cheap! 15-round magazines are also cheap and easily available.
It's just me, but I can't stand Sigs. I've put several hundred rounds through a P226 and P228, and they don't fit my hands at all.
You really can't go wrong if you get the gun that you like, but if it were me, I'd get a CZ75 or two.
Later,
Chris
P.S. If you can, you might give the CZ75 SA a try. It's a single-action-only variant of the standard CZ.