Hi all. Not sure if this is the right forum but I've been looking at upgrading my receiver (been looking at the new Denons) and I have been checking out ebay. The first thing I noticed is how much less the prices are. The units are listed as new and unopened and include the manufacturer's warranty. I have used ebay a lot but how "safe" is it to purchase new AV gear? Anything to watch out for? Thanks!