First, try a camera with a grip fitted - some people (myself included) don't get on with it at all, how hard is it to cock your wrist for a few seconds? Aftermarkey ones seem to get good press, while IIRC, some of the genuine Canon ones have problems with the grip rfusing to unscrew from the body - the plastic thumb wheel disintegrates (again, IIRC). I've used 3rd party batteries in my D70, D200 and compacts wit no problems BUT I would avoid e-Bay sourced ones like the plague, unless you know the company selling them well.