You might want to cross shop on
http://www.cpooutlets.com/drills/drills,default,sc.html (refurbished and new) to see which has the lower cost.
The top brands (Milwaukee, Makita, Dewalt) are pretty much comparable in quality. One construction pro has said the Rigid line should be avoided.
I can't see any need for a hammerdrill in FRC unless you are doing masonry work. While they are good for light duty work (drilling into mortar for instance), they really don't work well at all for any "real" projects and should be replaced with a rotary hammer.
Lion batteries are better than NiCd. There are a few top tier suppliers for each of the batteries and the major brands will source from the same companies.