I have the Sony 310 and like it. The upside is the "tune tray" is wonderful - my Ipod lives in there. I never take it out. The down side is that the screen is unreadable in bright sun. I have heard the marine version is better in the sun, but the 310 has a better equalizer.
I have a JL Audio amp (400/4) and two sets of JL Audio component speakers (ZR650's) in the fairing. The second set of speakers and the more powerful amp really really improved the sound system. I had an ARC system with their mini amp and one pair of their component speakers - pulled them out after about 6 months.
You'll like the Sony.......
His - 2012 RGC, Vivid Black, Bassani RR II 2>1 exhaust, Ohlins, Traxxion, SE breather, Dyno Tuned, JL audio
Hers - 2013 Deluxe, Birch White / Sunglow Red.