I have a Lawerance that I just keep moving from one sxs to the next. But if I didn't, I'd use an iPad! Been following the threads on the rzr forum, and that looks like a great way to go! I'd put all my music on it too!
Tough to beat the Lawrence HDS or Elite 5M baja. I use a hand held Garmin Etrex 20 that I also love. Garmin has better mapping and software, but Lowrance has the better unit.