I really dig the A23s, the theory behind wider rims makes a ton of sense to me. Given that these are for street use and will be used on the street, 32h 3x makes a ton of sense. In all honesty, depending on a couple factors I might even go 36h rear if this is a set not being used for competition that you want to hold up for years and years. The factors include your position on the bike, if you have a rack that you carry panniers with, if you carry a heavily loaded backpack, etc. Each spoke weighs about 6g so adding an extra four in the rear would add 24-30 grams but for a commuting wheelset could make a ton of sense. Also, go for brass nipples for sure.