This has been asked a few times, once within the last couple weeks in fact. Search feature is your friend.
P95 is a stout gun, reliable. SD9 is striker-fired and they fixed the tigger from the sigma. No personal experience with the smith but I hear good things.
Looking for a used glock-a model 19 particularly- is good advice. Or a S&W M&P.
I don't collect guns, I accumulate them.