I would suggest that you not buy anything until you have had a chance to handle, and preferably fire, as many different pistols as possible. Doesn't matter how great a gun is, if you aren't comfortable with it, it could be a waste of time and money.
A good used piece can be very cost effective.
People will ask for a round count when buying used. For years, I have shot M&Ps. I have no idea how many rounds have been put through them. But I know how much Titegroup I've bought - well into a second 8 pound jug, at 4.1 grains per shot - so my pistols are, well, experienced. Performance remains excellent.
Personally, I suggest you look at M&Ps, Gen 5 Glocks, Sig 320s.
I also think that you should consider an optic, or at least a pistol that is optic ready.