I've been starting to plan out a carputer system. I plan to include XM (via XM Direct), FM (radiator?), and a general aux-in for passengers. I assume this means I need at least 2 stereo audio ins-- I guess the FM goes over the USB tuner.

Anyone have any recommendations on hardware? I assume some software has the ability to switch inputs when switching modes? I poked around for this w/ FrodoPlayer but couldn't find it.

Or are people avoiding this problem or going about it a different way?