Cordless impact driver recommendation?

What is your favorite electric impact driver?
I'm looking lithium ion battery, and lean towards 1/2" drive.

Would be especially cool in the $200 range!

All these wants don't fit in the same tool. I wish you luck finding a 1/2" cordless impact with lithium batteries for $200. If you do it won't be very good quality or have much of a warranty or service if you do need warranty.