Insurance is fractions more if at all, hardly worth worrying about.
So much talk on here about jdms being difficult to shift, yet every week (almost) someone asks about buying a jdm (two this week inc yours), check the classifieds for what have sold and what havent, you can do an advanced search on ebay to see what has actually sold and for how much, advanced on search options to left of ebay search bar.
Stereo, most people replace the Bose for double din so that renders the sat nav point mute.
The only thing i would ever be wanting is Brembos (which you can get on some jdm), dont be put off by jdms, buy the car which is in the best condition and suits your requirements best for the money you have, you will have no trouble selling a jdm
Well said. My advice would be to ignore the UK or JDM issue completely! Buy the best car you can afford for the money with the best spec and the best history. I imported my car direct from Japan seven years ago with £2k miles on the clock. It was version S which is 'sport' which meant it had brembos and cloth seats. It was immaculate and clearly someones weekend car. I had all the SVA stuff done, undersealed, foglight conversion (properly not bolt on) and had the seats changed to black leather with orange trim which look fantastic. After all that I still saved a packet over buying in the UK at the time. The cars are ALL THE SAME bar spec items. However, they are ten a penny in auction in Japan due to their crazy 3 year ownership laws so the market gets flooded with three year old cars. For an 'older' car I am certain that my car is probably one of the best looked after examples there is and would be head and shoulders above a lot of cars in it's price range UK or JDM. Just look for the best example you can find with the spec you want and don't worry.