| Unfortunately MINI dealerships generally have the same mentality as their parent BMW dealerships, in that certain cars must have certain options (all 5 Series must have leather and Nav being the best example) to be desirable, so most would say the CHILI Pack is essential on an S.
The reality is that yes, the car is worth less without it, but it cost less to start with, so the difference is negligible.
I've always been a firm believer that you should buy what you want, not what the next owner wants, and you've listed what you want so go for it. | 
