I just built a commuter RB and the rear wheel I'm using is approx 5mm short of reaching the dropouts. The quick release takes up the slack nicely when tightened and the axle is then thouroughly recessed in drop outs. So far, I've put around 500 miles on it and I absolutely love this bike.
1. Is it okay to take up the 5mm slack with the quick release?
2. Is there any brand that's better than others or stronger material?