I shot my 627 PC for Steel Challenge for years with lots of success. I shot 38 short colts in it and used the same load for my USPSA and ICORE matches. I got on the band wagon and bought a 929 to replace the 627. No need really, I just wanted the Wow factor of a new gun.

I used Blade Tec and then switched to a speed holster called Guba Ribas which was very fast. I tried the CR Speed and it's the only holster my gun ever fell out of so I gave up on it.

All the guns you are looking at will work. If you go with the TRR 327 you will find it a little light for anything but Steel Challenge. It does have faster transition times for SC so you may like it.

Good luck.