I used to have a facelift 54 plate Mini cooper S John Cooper Works, it had every option JCW bucket seats, JCW engine upgrade, JCW exhaust, JCW body kit, JCW alloys, Harman Kardan stereo and speakers etc. I
I sold it at the end of last year after having it 5 months. I had a Zed before buying the mini and it just wasn't the same from build quality and engine sound, although the JCW exhaust does have a very nice popping sound to it
The car was great fun to drive and extremely fast , i believe the JCW engine upgrade made it about 210bhp.
I heard that the newer turbocharged versions suffer from turbo lag compared to the supercharged. sopmething you might want to consider.
Models before the facelift 54 plate had quite a few problems, a problem with steering column was one of them and quite pricey to fix. They put all this right on the facelift 54 plate.