I bought a Makita HP1501 about 8 years ago. It is a drill/hammer drill, 1/2" keyless chuck, variable speed and it is rather light weight. I am rebuilding an old chevy truck and I have used this drill, to drill out bolts, drill new holes and I can't count how many pieces I have cleaned using a wire brush in the chuck. I haven't had any problems with it.
I can't help you with the cordless drills, I am actually looking for one myself.