I have the Fusion RA70... it is pretty nice... however... the AM radio (for sports) isn't that great, also I really don't understand what the hulla balloo is about N2k on your media player. Most people now keep their music on a Bluetooth media device, ipod, smartphone... and though there is a small control panel on the chartplotter display..... I find it more convenient to use the smartphone to control everything.... the small display offers very limited options, it is not like a regular remote control. So any good quality BT player with adequate power would work ... N2k or no.
The reality is that Bluetooth has made all this docking and networking irrelevant... IMHO.