"These are combinations my three friends have. Please elaborate on your pick. "
My friends picked up guns they liked, or guns they got good deals on.
I see no reason he can't have friends with 3 different combinations.
WHY you would seek to emulate something like that I do question.
For instance I passed on a Dan Wesson Bobtail when @ 900 dollars.
What are they now? 1500? I passed because they are not much more concealable then a full sized 1911, and I already have a custom 1911 Kimber that shoots .45 Super, and a Detonics Combat Master that does as well.
To make sense I would have picked up a 1911 with an alloy frame and the Commander size.
That doesn't mean the Dan Wesson isn't an excellent choice for a carry gun.
It is.
The P30 looks like an excellent gun. It looks big, and I can't own it due to magazine capacity in the People's Republic of California.
However, if you can get a carry permit for it, and carry it, I'm sure it's an excellent, accurate gun, with high capacity, in both .40 and 9mm.
The problem with the question is it's not specific as to the calibers of the weapons involved. Is the sig a 9, 357, or .40? etc.