1. Mac Mini with Front Row. Use bluetooth elite for phone support. Done.
2. Ride Runner - The basic configuration works just fine and the default skin is simple. Bluetooth integration via lambosprit's plugin is possible.
3. Centrafuse - paid option, new skin is simple, works pretty well.
4. LinuxICE - also works well, not sure about BT. Lot of devel work going on.
Don't forget to check out others that are under development like RevFE and OpenMobile. Download them and try them out.