I just picked up a 2011 Cooper Coupe with Pepper pack.
Having owned a couple of previous minis that were Coopers, with Chilli pack a few differences that are obvious ...
The Chillis I owned had ...
The 2007 model had cruise / mutip function steering wheel
Having said that, this Pepper model has (that my previous cars didn't)
Auto dim rear view mirror
USB / ipod connectors
Not sure if these were included with the 2011 Pepper pack, or if they were additional options.
Best advice, view both cars if possible, consider age and mileage, then pick the one you like.
Even a bog standard mini one is great fun ...