I have no experience with a Bersa, or, the particular Beretta you mentioned.
I have several Glocks, and they have never missed a beat, but, for ME, they are too "blocky" to carry.
If you managed to get a good CZ, that's great, if you have to deal with their warranty dept., good luck. No more CZs for me.
S&W M&P series pistols have been good to me,and are comfortable in MY hands.Another plus for the M&Ps is that Crimson Trace makes a laser that replaces the backstrap, which is about the same size as the medium, which fits me.
SIG 239. I bought one when they first came out, and still have it. Pretty accurate, for a smallish gun, not terribly hard to conceal, reliable, and of course, mine has Crimson Trace lasergrips on it.
Rugers are well built guns, at a decent price, but, I don't like the way they fit in MY hand, and generally have pretty nasty triggers, that take a lot of work to master.
I looked at Khars, because I wanted something smaller, lighter, and easier to conceal than my SIG 239, and M&Ps, but, when I fondled a Kimber Solo, I HAD to have it. For a tiny pistol, it is surprisingly accurate. Kimber says they are capable of 3", or less at 25 yards. I'll never be able to do that with my poor eyesight, and the short sight radius, but, can easily make head shots at 15 yards with it, and another plus for the Solo is that Crimson Trace makes lasergrips for it. The negatives, for the Solo is that so far, Kimber hasn't actually come out with their 8 round magazines yet, and it stings a little to shoot it.
If I was looking for one that I was going to take to a class that involved a high volume of shooting, it would be a tough decision between an M&P, and the SIG 239.