Look at the parts list on the V Spec.
Normally I would opt for the V Spec as well due to it being a more sought after model, however given the modifications, im sure the previous owner in Japan made good use of them, be it at a track or on the street, so I wouldn't write off J-Boys assuming that it has more wear and tear than the V Spec would.
While J-Boys car has been heavily track raced, its got a fair whack of history to back it up, which is a good selling point, not to mention the fact its a proven performer with what appears to be very comprehensive list of upgrades.
At the end of the day, Paulies buying the car to violate at the track, so with that in mind, dollar for dollar, J-Boys is better value.
Disclaimer: I am not getting any kick-backs from J-Boy for my recommendation