I am looking to upgrade my old Mini DV camera to something that takes HD video. I will be using it to film business' and action sports in dusty environments. I'd like something with internal memory and a slot for a SD (or similar) card for expansion. Would be nice to be able to screw in a clear lens cover to protect the lens from dust. I'd also like a remote either wired or wireless. I prefer Canon but am open to other brands. Something that connects easily to the Macbook Pro would be handy. What other features should I be concerned with? I'd like to be in the $500 range. Thanks or any help!