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I've shot .357 Glocks and owned two 10mm Glocks G19SF and G20SF. If I were you I'd either get a G20 gen 4 or just stay with 9mm and get a G17, if you have 5 other 9's it just means you probably already have ammo for it. Right now all my handguns are 9mm and one .22 and I've owned tons of different calibers.
edit: to be honest investing a ton of money in a Glock is a waste, best to leave them stock.