I'd just get a few G17 mags for now and use them n your G19 (and G26). Don't even need grip sleeves unless you like the way they look. Be careful with sleeves though, they can tear up your hand if you slam in the magazine!
If you decide to get the G17 anyway, the extra mags weren't a waste of money.
If you decide to get the G17 anyway, the extra mags weren't a waste of money.