I would recommend park distance control and the rear view camera. BMW's rear view camera is really good. It displays excellent lines that are super helpful. My parents have a rear entry/alley garage and a really shallow driveway. My car does not have PDC and I wish it did everytime I back out of their driveway.
Present - '06 E90 330i sport; Past - '04 E46 ZHP, '00 E46 328i
www.bmwcca.org member #388003 - Use me as a referral & you could win a one day ///M Driving School!!