Rambox- Looked at it. It's interesting but I dont like the look, odd shape interior or smaller bed. I'd get a nice low profile tool box across the front of the bed instead.
I LOVE the 730N. I was totally used to in in two days and the features are amazing. The sound quality surprised the heck out of me and I have experienced zero issues or glitches.
Mega cab - Thats one of the top 3 reasons I bought a Ram! Its like a limo in the back of this thing.
I came from a long bed crew cab Chevy and my Mega cab 6.5' bed is easier to drive around parking lots. I think the turning radius is alot better than my Chevy was.
Enjoy your new truck! If you're like me, Im happy I got it loaded to the gills! Being a 2500HD, I can still tow 10K with the Mega cab which serves me just fine