I currently have the Marantz SR7002 and previously the SR7001.
I've been looking at the 3808CI to because of the DTS-BOMB and True HD popping issues with my SR7002, as well as the Subwoofer -9db Audessey issues. These issues are apparently corrected through Firmware updates but, the Marantz units do not allow the user to do the updates and it must be taken to a Auth service ctr where it could take two weeks. To me its a PITA and I don't like the idea of shipping my electronics out and risk having it damaged in the process.
The 3808CI has network connectivity making it a snap to update your own FW. Other features like internet radio and Audessey MULTEQ XT should be an improvment.
Marantz is very user friendly, has outstanding sound for music and from what I've read, "The 3808CI is not user friendly, has a terrible manual and remote, sounds better for HT and not bad for music and once setup your good to go".
I still haven't made up my mind yet but, I'm leaning towards the 3808ci or 4308ci.
Cheers,
Ray