when I bought my NR509 it was specifically for the networking. This model was revolutionary when released for having such features at this price point. At the time I wasn't really thinking about using it for network radio but it's really nice to be able to listen to my favourite internet station without having to turn the pc on, and be able to access music on USB or my NAS is pretty cool too, as is the ipod app, but my main reason originally was for voice control.
Your model probably supports fairly comprehensive control via IR so with a USB-UIRT, or a windows MCE transceiver with blasting capability, or a HALX (soon to be available I think) you would be able to do a lot. I don't think you'll ever get commands like "set volume 27" with IR and it is unidirectional, but still you can do almost everything else, like selecting audio or video input, DSP mode, volume up and down, adjust base, treble, center channel level, etc. I can do all this on my 509 with IR.
I guess it is possible that the NR models have more IR commands than the SR models though, I don't really know.