I could easily pull off 1200 power with all Overkill augments, however, there was a great debate on the Merc forums where a few members went head to head with numbers and Aim still slightly pulls ahead due to the crit increase. I get slightly over 1% crit chance using all Aim augments. Using Power nets you a slightly higher DPS increase (potential) than using Aim without its crit qualities. Once the crit is factored in, Aim pulls slightly ahead.