Rims are 32 hole, 28mm wide AM rims by Sun ringle. Sealed bearing hubs, disk brakes, and 9sp if that matters at all? Rider weight is ~150lbs. The wheels will see rocky terrain, small-medium sized jumps, and 1-3' drops on a regular basis.
I did some reading, but still unsure if I should get double butted or straight gauge for MTBing, and it seems like I should go with brass nipples, right? 14/15 gauge from a reputable brand and brass nipples?