Nice work, and great playlist! As far as short and underwear go, I like the 2 in 1 shorts with built in compression the most by far for comfort, performance and resistance to chafing. These are good ones.

http://www.saucony.com/en/interval-2-1-short/11832M.html?#cgid=mens-apparel-shorts&dwvar_11832M_color=SA81185-LAKP&start=1&sma=sm.001fqpvln193be4wzjs28hpc34wpu