Hi Mark,
I'm also an Aristo MKII owner in HKG. Frankly speaking it is not equal to old man when you are driving this model in HKG, especially a lot of people here have mod them.
When you are buying it here, it is better to be careful on choosing a right dealer, as some of them are not well maintained. For a car with 5+ years old (which most commonly available in the second hard market), you have to think about the maintainence.
Again for the gas price in HKG, I've to pay about HKD2.30/Km, and GTR or EVO costs more than this figures (as you are not able to control your right leg when you ride on it, it at least apply for me).