I've been considering trying a Parasound 855a amp. I've seen that some of you have gotten great deals in the past on UBID but in the last 2 to 3 weeks I have not seen one Parasound amp posted. Does anyone know how often UBID has Parasounds for sale? From another source I think that I can get a brand new factory sealed 855a for $400 shipped. It seems like a good price but I don't think that the warranty will be valid so I'd prefer buying on UBID since I've seen posts that say that UBID is authorized to sell Parasound. Is warranty something to consider or am I passing up too good a deal? I will be using a Denon 2802 as a pre/pro driving Studio 20 fronts, Studio CC, and Atom rears. Will the 855a be an improvement over using the 2802?