I am in the process of deciding which A/V reciever to purchase. I like the idea of being upgrade the receiver for future formats etc. however am a little sceptical as I fear that manufacturer's would rather encourage customers to upgrade to their new model rather then keep their old one and upgrade. Has anyone had any experience in upgrading their receivers and should I place a high emphasis on software upgradability on my buying decision? Your thoughts/experiences would be greatly appreciated.