I use the M&P for USCA 2 gun and USPSA matches so I like that the glocks and M&P have lots of accessories and mags available. I have heard issues with earlier productions needing the barrels replaced, but mine is a 2012 model and it seems to be pretty accurate when I dont throw my shots off.
The PPQ is a nice pistol and has a good trigger out of the box. Very similar to the HK p30 but cheaper.
What issues have you seen with the Gen3/4 glocks? I've been eyeing a gen4 G19 to replace my gen2.
If I had the coin, I'd love to take one of the Vickers courses. I highly recommend anyone that is into firearms to try a 2 gun or 3 gun competition. Its the most fun i've had outside of my z.