I have a full body kit on my
MCS and I also really like how it makes the car stand out of the crowd. The bodykit on mini.ca is 1915.50$, so I assume 3000$ includes the fitting. Also the extra money might be for the wheel arches paint job which is not included in the price (but makes a noticeable difference, specially on non-black cars).Regarding maintenance I've only driven ~4000kms so I can't comment on the service history yet. All I can say is that so far so good, except one cold morning following a rainy day (gotta love extreme temp variations) the shifter mechanism was frozen in first gear. Lucky me I was parked just outside my garage, never happened again either.
Good choice on the mini you'll love it. Just remember, it's a performance car not an economy car (don't be fooled by the small displacement, it's thirsty on gas). Go kart handling comes with go kart suspension (damn potholes).
I went to Mini Brossard before buying too and I had a very pleasant experience. Didn't buy there cause they didn't have exactly what I wanted though. good luck on your purchase!