played locks up to lvl 35 ish and found that affliction, though my FAV lock build just didn't suit me well for boxing. Seemed like shadowbolt spam was the way to go. Easier to macro and very little micro managing in terms of dot dot, tap, drain, tap, drain, redot, etc

sb spam is basically SB, SB, SB, SB..... or toss a corruption up to start with if you feel like it. Really easy and great DPS.