Thanks jakey and Statts, appreciate your guidennes, this is a terrific like minded community and I'm sure other members will learn more from these processes.
I will take your advise and go for the proven Nexus 7. Unfortunately I don't have the skills to flash the ROM and after phoning numerous audio shops in Brisbane no one seems to much knowledge or to be to helpful.
If I only need internet and run apps
Do I only need the following?
Nexus 7 Tablet
Subaru Sat Nav Facia
http://www.japanparts.com/db/parts_deta ... RCH_page=3
Where could I buy the UCA-202 > FSL-21 aux in adapter > McIntosh stereo. FSL-21 plugs in-line to changer connector - Electric Design FSL-21 McIntosh AUX in unit?
Where do I buy a Mini-Box DCDC-USB Power Supply and do I need this for my basic setup?
Cheers,
John