I now have the PC.
1.4ghz Duron (AMD), Not the fastest ever but should be pefect for this application.
Got to get RAM etc, think I got a Hard Drive laying around though!
So.. just need an Opus 150W and screen now!!! 8)
Update... just ordered carpet (hope it's a good colour match!) two fans + grills, amp wiring kit for power.
So just now need an M1-ATX, power dist block and screen to get everything running!!!!
Still deciding on sat nav software, really want Mobile Impact as front end but for some reason keeps crashing on my PC Probably will use Destinator with Free Drive for sat nav.