I own a model 22 for work, and absolutely love it. A great shooting gun. I have also shot the 27, and I like it alot. A very accurate gun in a compact size. If I were going to buy one for CCW purposes, I would go with the 27. The 22 gets very uncomfortable to carry for an extended time.
RR, have you tested the Hydro-Shoks on anything? We have discontinued using them at work. We tested several different bullets, and the hydo's wouldnt expand for us on everything from deer, to water, to gelatin. The Rem Golden Sabers, and the PMC Starfires were both excellent at expanding, and penetration. Just my .02 cents, something to think about.

BTW, my trijicons are now 10 years old, and still glowing like the day they were installed.