No run, no odo is really pretty shaky for an '07. It's arguably a collection of parts in an unknown state. What are those parts worth?
Can't really comment on price as I'm in a small and strange market, only give my point of view, but here I'd pay 750-1000-1500-2000 GBP for a worn but strong runner depending on year and state - take these numbers with a grain of salt!! - a friend got a really strong '05 450 for 600 GBP - I'd be hesitant to pay 500GBP for that bike. Knowing what I know now.
If I speak really super honestly.