I am getting ready to get my second X5 and I wouldn't get it without the sport package. The drive is awesome and I also have never had complaints on road trips, it's very comfortable. You were saying you have 18 inch wheels that comes with getting the sports package. I know that 17 is stock so maybe when you get the sports package you have your choice of 18,19 or 20. Since your in CA and don'thave to worry about the snow I would get the 19 or 20". They really sets your X5 apart from the others. It's one of the first things I notice.