Thanks to PENG for mentioning AirPlay. With the purchase of an Airport
Express for about $150; thereafter, connecting it to a wireless router/modem and to receiver or pre/pro, you can enjoy iTunes and music library wirelessly from laptop to HT using AirPlay. This does pretty much everything that the NA 6005 does, up or down sampling everything to 16/44.1. And you can operate from your iPad or IPhone with Apple Remote App or iTunes App on those devices. It appears thus that the only advantage for the NA 6005 would be for its DAC, which can deliver hi-res audio. Thing is, can anybody distinguish 24/192 from 16/44.1? At any rate, like you, I am still thinking about the Marantz products; but, the more I think about it the more I think about just upgrading to an OPPO 105D. With it I will truly be able to enjoy what I can not enjoy now, namely multi-channel SACDs, as well as have a nice usb DAC.