Texas, this is what I settled into while running the triangle for the first time. It worked out pretty well, and I've used it as a baseline for the Triangle, motion or flex.
Starters Distribution: 16-16-16-10-6
Bench Distribution: 12-8-8-4-2-1-1
Generally speaking, I aim to get a Gaurd, Post and my SF into the 16 distribution spot, w/ a backup post in the 12, and backup gaurd and SF in the 8 distribution spots off the bench.
However, I'll always tweak the spots of emphasis towards my strength and against my opponents weaknesses. Sometimes team makeup will require/enable me to alter the distribution a bit as well, but the general guideline has worked pretty well. Of course some will say the general setup doesn't make that much of a difference that the talent level matters more, so take it for what its worth.