i like the sears c-3 assortment. they came out with a lithium battery
and it works with the older c-3 stuff as well as the newer models that
come with the lithium batteries - wait for a sale! They have a drill
driver with radio, charger and lithium power (2 - I think) for around
99 bucks when its on sale. I;ve had my C-3 set since they first came
out (5years?) and the original batteries are working fine. I have the
set with the saws all, drill driver, mini skill saw, sander and silly
light (but it has come in handy - better than a couple of D cells and
the old flashlight).
I mainly use the drill driver and saws all and, though a hobbyist/
homeowner, I've built quite a lot of stiff using this set and it
appears to be going strong yet.
I have read where it may be better to rebuild your battery pack than
buy NOS packs that may have been sitting an a warehouse since the
model first appeared on the market. Shared for what it is worth.