What's the best battery powered impact driver?

[notbob]

I'm saving for a Hitachi WH18DL. Can I do better for less money?

nb

[Stormin Mormon]

I got one of these:

and it has served me well. It gets used once or twice a week, and does good. I used it last week to shear heads off a couple rusty screws, so I could back em out with vise grips.