Here's some recommendations:
$70 Skil 12v drill, 223 UWO on included 2ah, 341 UWO using 4ah.
$170 Milwaukee M12 drill, 368 UWO using included 4.0 extended capacity battery, 455 using 5ah extended capacity high output.
$220 DeWalt DCD800, 926 UWO using included 5ah XR.
Personally I'd go for either the skil or DeWalt dcd800, though if you need a hammer drill for concrete the dcd805 is the same with hammer drill function.