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Do you mean a .22 conversion kit, or converting to a different centerfire calibre?
I've got a G17 and an Advantage Arms .22 conversion kit. It's picky about ammo but runs well on the right stuff. Damn thing won't fit in any of my holsters with the AA kit on it though.
If you have smaller hands, a G17 (9mm) or G22 (40SW) is in order. Larger hands would benefit from the larger grips on the G20 (10mm) or G21 (45acp). The Advantage Arms kits work great and can be fitted to any of the above pistols - just pick your centerfire calibre of choice.