Hey stu and welcome from a very wet Dartmoor ! I would go for the Roadster .
As for the questions ? I would be SOPHOMORIC in trying to answer questions I knew little about . But , rest assured the big boys with the knowledge will be along very shortly .
I apologise for the sophomoric quote , I bin so impressed by the word that I just had to find a sentence in which to use it !
Good luck with the quest and I am sure you will be more than happy whichever model you choose .