Mines an import, it was a little cheaper but not much to be honest...
I don't think there is as much of a stigma with imports as there used to be nowadays, I got full documentation and pics of the mileage etc when I got mine.
At the end of the day its up to you, UK SPEC will prob hit a wider audience when selling it on but to be fair 'like a Supra' I had the Zed isnt a particularly common car so they are easy enough to sell on. After I bought my Zed I did a 'mock advertisement' of my Z on Ebay to see what interest I would get and I was offered £500 more than I paid for it from the garage so dont worry if you prefer the Import