Sorry to read you're selling up, but looks as though you've had fun with the ED30 and taken it about as far as it can go!
Must admit, I love my ED30 but I have been thinking about something 4WD too. I can't justify it as I must buy a property before I am destined to rent forever, so it will remain a pipe dream for now...
Really not wanting to be a vulture, but I'd be interested in the DAB RNS510 if you'll be removing this from the car... I have an RNS version H if you'd be interested in a swap plus cash your way...