[fishweewee]

Both are very concealable - I own and carry both the 23 and the 27, even though the .40 short and weak is not my favorite cartridge.

You can easily get an IWB holster for the 23 and I've carried the 27 in an ankle holster with normal pants.

The nice thing about having the 23 full size model is that you can get drop-in barrels in other calibers from Glockmeister.com. The 23 is chambered for .40 S&W, but, having discovered that I didn't really like the way the .40 recoiled (too "fat") I plunked $150 on a new .357 Sig barrel for the 23 (and some more money on mags). And voila, I got a new gun at a fraction of the price.

I'm a real fan of the .357 sig caliber in a Glock (was more or less recommended to me by the folks at Lethal Force Institute) - it is inherently more accurate and has an extremely crisp recoil, and so far has favorable results on the Street as far as stopping power goes. Con is that the caliber is more expensive and a pain in the arse to reload due to the case neck. But I digress.

If you want to improve the trigger pull, I strongly suggest having an armorer upgrade the stock trigger spring to a "New York One" trigger spring. It increases the lbage but paradoxically releases less sluggishly, resulting in better accuracy. This upgrade only costs something like $20 to get done.