No discernible difference between any of the models, some people reckon JDM has slightly stiffer suspension than a Uk , but I would doubt it..
Base models have TractionControl, ST models have VDM,you can switch both off (I know I do as soon as I start up! ) To be honest theres only minute differences between a JDm and Uk .. JDM's far cheaper though and generally speaking in the used market they are in better condition / lower mileage than the equivilant year UK car..
I've been more than happy with my JDM and with not having to bother keeping up with a warranty from Nissan has allowed me to modify as much as I want and not be tied into main dealer servicing