JokerG23
You never mentioned what you plan to do with this pistol. If it is just punching paper whatever catches your fancy works.
I am guessing from your handle that you have a Glock 23, a fine carry gun. A 10mm probably won't make much improvement,over 40 short and weak, in your average self-defense scenario. A G29 is close to the same size as a G23. I prefer a full size gun in the 10mm to wring out maximum velocity gains. I see the G20 as an ideal candidate for a woods carry gun. A fairly heavy bullet, at a relatively high velocity, with high capacity makes you feel safe like your wrapped up in your dad's old coat. The light weight to payload ratio provides comfort on the trail. If old ursus horribilis roams your backyard, you might want to step up to a .44 mag. I have a G20 SF with a grip reduction, 3.5# connector, wolff 22# spring and steel guide rod, with a six inch lone wolf barrel. Makes a nice wilderness carry gun, as does a stock G20. Unfortunatly they won't ever look as pretty as the DW's Olympus is showing off.