I'm wanna know am I using the "best" dps specs atm....

Currently I'm using a 61 Sin/ 9 MM / 6 Ranger (melee build), and a 61 Ranger / 12 Sin / 3 NB (ranged).

I've heard of a build NB/Sin... tho haven't tested it.... is it better for melee, and is there a better ranged spec?