Next buy is a 1/2 or 3/8 compact impact wrench... I'll stick with the M18 as the batteries are compatible across all the tools in the series
Anything 5.0 - 6.0+ mAH Battery wise is not inexpensive. Had one of my Dewalt batteries go deeed on me early on. Shows a charge but couldn't handle a load. Just recently found a reset hack that seems to have worked