probably too big for concealed carry, unless you mean in your car, i carry a 357 in my car so the sky's the limit on size as far as that shit goes
my CHL instructor last year had a PX4...he seemed to like it a lot but they just kinda turn me off honestly. first of all it's one of the ugliest guns ive ever seen, and it's also got all of the same drawbacks as my glock, except the glock does practically everything better than a PX4 from what ive read
so if youre fixated on a polymer framed gun that has almost no frills and no moving parts, get a Springfield XD or a glock 19 or 23, they'll probably be better for you in the long run
but if i had to buy one handgun that would be my ONLY handgun for the rest of my life, i would have to go with some variation of a sig p226. i really cant say enough about how amazing that gun is, im buying one next summer i think.
"Just ahead, over the rolling wheatfields all golden beneath the distant snows of Estes, I'd be seeing old Denver at last. I pictured myself in a Denver bar that night, with all the gang, and in their eyes I would be strange and ragged like the Prophet who has walked across the land to bring the dark Word, and the only Word I had was 'Wow!'"