I'm currently using the E-510 for indoor pro-wrestling photography, with the default 14-42mm lens that it came with. It works pretty well, though reaction time indoors is a little slow, and since it is a cheap lens there is obviously not a great zoom on it - I can only get good close up shots if the subject is right up in my face. I'm looking to upgrade, and was hoping for some suggestions that would fit my needs - it certainly needs to focus quickly in indoor situations, and have a decent zoom on it.