I'm thinking along the same lines as you. When i say a £40k I also mean a 12 months old car with 5-6k on the clock, delimited with any warranty issues remedied by that time, hopefully.
I reckon approx £40-45k OTR is a realistic figure to be paying for a 12 month old JDM import this time next year. The uk market will inevitably then be flooded with imports, like the zed, which will kill uk car prices. As with most cars, once you drive it off the forecourt you've lost 10-15%......