Actually, that's EXACTLY what I did this year --- chose only one Glock to be my ONLY gun for all purposes from here on, and I chose a Gen 4 Model 26. Reliable. Concealable. Accurate. Adaptable with all 9mm Glock mags. What else can you want from a gun? It is rapidly becoming like an old friend whenever I pick it up. Guess I'll have to name it pretty soon in order to formally adopt it into the family.
P.S. - with Federal 115 grain +P+ hollow points (9BPLE), I feel TOTALLY well armed with a weapon that can defend me and my family from just about anything that is likely to attack us in the U.S. (outside of a grizzly bear or large black bear). :-)