I'm looking to buy one, and I've got a "WTB" thread in the classifieds, but I was just curious.. for those who bough theirs used, anything to look out for? I know I'd prefer a new one (locking arm / blue LCD), but anything else I would want to check on? It should come with USB cable, right..? Anything else? I hate to have to buy a used one, but I just don't see these new ones coming out anytime soon.. I've been watching since late Feb..