The HP8 mk2 was on my shopping list also, but I decided to go with the Crack which was less than half the cost of the standard HP8 MK2 even with shipping to the uk. Add the Jenson cap upgrade to the HP8 and it starts to mount up quickly. I would be very interested to compare the two.
I am very interested to know how the HP8s are in compare to the Crack. I've just heard good things about them as same as the Crack.