The D40x isn't a bad camera, I owned it for a few months. I liked the interface and how light it was but I just needed more. If you're looking at the D40x seriously I would suggest the D40 instead and save the money to spend on glass. But I don't think the D80 is overkill, the D200 may be. I'd say either get the D40 and have to get only AF-S lenses in order to auto focus or get the D80 and be able to get almost any lens to auto focus. I would imagine that inside a home may have low lighting, this is where something like the 50mm 1.8 prime would come in handy, you can get this with the D40 but it will not auto focus.