In reply to Rapsling:
Hi,
Consider the ballence between light and usable. The 19g are tiny, too small for me. Phantoms work well for me in both wire gate and screw gate, plus are a little cheaper. The pure slider is also a consideration as a locker. That said you may want one larger screw gate for some belays especially is using a single rope. Always worth bearing in mind that a lot of folk carry too many screwgates, you can always use a pair of snap gates if you run out. I Don't have any, but alpha lights look to be a good full size option.
Lighter carabiners will dramatically lighten your rack, though it's part of a bigger picture of carrying just what you need for a particular route.
Wayne