I have been going back and forth between these three 18V Lithium battery systems.
I have also considered the Milwaukee 12V for a compact drill, it gets excellent ratings, but I'm not sure if I would be satisfied with the power. It might be worth a try for $130 though.
Right now I just want a drill or two. In the future, I'd like a jigsaw, maybe a Multi-tool if available in the line.