Welcome to the forum Chuck.
I just bought my first Glock about 2 1/2 months ago and have began to like them more every time I shoot.
For your needs/wants, I would go with the .45. The 10 is a little more difficult to find on the shelf and expensive to add. The .357 is not as bad as the 10mm but the .45 is found the easiest (in my area).
Also, i think you can get a drop in barrel to go from .45 to .357 it you want to try something different.
Glocks are fun and not too bad on the wallet. Once you buy one, you will want another. Not as good IMO, but fall in the same category as your P230. I would almost bet you have more than one Sig??