Like the 21. Tangle, I really think you just like the enjoyment of having or trying something different.:)
The 357 sig is great, however, for a real fun gun to toy with, that has ALOT of real world versatility, I really think you would enjoy it tremendously.
Get the Sig barrel for your G22, and pick up a 10mm Glock. You should be able to work a good trade with some of that excess you have in the safe, lol.