If you have larger hands, stay away from the 19. My wife has one and I have a 17. With the new finger groves in the grip, my fingers to ride on the peaks, instead of in the valleys. If you can find an older one without the groves, go for it.
I would say stay away from the ported barrels. The 9mm doesn't have enough kick to warrant it.
Go to your local gunshop and order a pair of good after-market sights, Novak's get my vote. They can install them easy for you.
Only go with factory clips. You can now get 15 or 17 rounders for under $20.
I have always liked lighter bullet weights for the 9mm, 115's and 124's, and my Glocks like them as well.