I can't make up my mind now- OEMretros doing fiscon + rns510 would be about a grand and be BCD and OEM, but the partial postcode Finding would be pants- I'd hate to pay that money and still end up using my Tomtom 940!
I'll probably go with the kenwood, as for around £1300 you get blue tooth phone and music streaming, and a generally better satnav, bigger screen too, will still work with the steering wheel and rear view camera if I get one