Ahh yes, the same decision I was trying to make before. The correct answer, depends on your situation:
First, all those are great "no regret" guns. Super reliable, and will be something you can pass to grandkids.
One of my friends who's an ex-CIA agent told me this. "Get a Sig. Sig's are passive weapons, they work like a Swiss watch, super accurate, and graceful in all they do. If you want a defensive weapon, the I highly recommend a Glock. Guarantee to go bang when you pull the trigger. If you want a weapon for 'aggression' (I don't recommend, unless you are SWAT or something like that) then I recommend an HK. Sig for target, Glock for defense, and HK for offense."
I think the glocks are great, super easy to field strip, and super reliable and durable. If you feel the need to soak your gun in salt water, then by all means, get a glock. If you like to carry a gun "cocked and locked" then get an HK. Durable, reliable, but a bit bulky. If you want mostly target practice, then get a Sig.
If you have the money, get a P229. If you don't (like me) get a SigPro 2340. Beefier slides, polymer handles that greatly reduce the recoil, and it's a sig, for the price of a glock.
One note on the glock 23's, not a fully supported barrel, so don't feed it reloads and super hot stuff, not a good idea. You can get like a Jarvis or Barsto barrel that is fully supported for it, but that would put it in the price of a Sig...
Shoot safe!
Albert