G or N Reg?
I note what has been said before but no-one has really addressed the Maintenance Issue. If you are on the N Reg, your Maintenance will need to be done by a Licensed A & P Engineer or an Organisation Approved by the FAA to maintain your aircraft type. Have you located such a person or Organisation ?
It's interesting to note that Donald Trump, President elect of the US, who would surely qualify to use an N Reg, has an S76B located in UK and that is on the G Register (G-TRMP).
If it were my helicopter, I would be inclined to use the G Register and an EASA Part 145 Approved Maintenance Organisation. That way you can be assured that the Organisation has full oversight by UKCAA which will ensure a good and appropriate standard.
I'm not saying that FAA Standards are lower, just that oversight is more difficult and perhaps too relaxed...... Just my twopenn'orth
Sq