FWW had a test on 18v compact drills, Makita BDF452HW won best value and performance.
I am getting the driver impact combo from Amazon,
http://www.amazon.com/Makita-LCT200W...m_cr_pr_sims_t

$15 more and you get an impact driver for screws. free shipping too.
It comes with 1.5 amp batteries, you can use the 3 amp ones too, $113 a pair , $65 each.

The teal colored tools are industrial grade for contractors,
Am in the exact same boat as you, I did research thought this might help