I currently have a fresh import V60 T5 as my daily, brought in to the country last year.
I've also had an Alphard that I brought in myself, a DC5 and an imported MX5 so had decent experience with a couple of models.
Theres a steady stream of 'normal' things coming in now, quite a lot of Volvos and Golf GTI's seem to be being listed.
I would go for the import every time, subject to the car VX report etc.
If an auction car I would aim for a 4b but some 3.5's are fine, I think my Volvo was actually a 3.5 off the top of my head but is far better than my grade 4 Alphard was.
My Volvo was like a brand new car on the inside, literally incredible. Outside was far better than any UK equivalent car too.
Service history can be a little bit hit and miss as you are at the mercy of what is in the car at the time of auction but I was lucky that I have full Volvo history, the service book just keeps unfolding.
If bringing in yourself budget for new tyres and brakes at the very least as their tyre laws are 'interesting', my Alphard had a giant split in the rear of one of the tyres.
Possibly likely to need a battery too after the journey.
And the reason you buy Japanese, an 11 year old car:
My Alphard: