I love love love my CZ. About the only complaint I have with it is the factory sights are just ok. Everything else is fantastic.
I handled an FNX9 at the store. It was very nice too, but the ergonomics of the CZ were much better for me.
If the Sig feels "a little bulky" I'd skip it. I bought a Glock that felt "a little bulky" thinking I'd get used to it. Big mistake. I sold that gun about 6 months later.
Handguns are very personal, though, so pick whichever one feels most natural in your hand. All the models you mentioned are good quality so trust your gut and you can't go wrong.
"If some monster tries to rape or murder a woman I care about, I donít want him to see the flickering light of a candle. I want him to see a muzzle flash, from the front." -- Massad Ayoob