Okay so I looked around and I've found this two that are similar in year/mileage... The M3 costs 15k more... Would I really be missing out by going the cheaper route? I don't really know much about them to be serious, I've looked around a couple forums to see what to look out for... When I talk about difference, is there a HUGE difference? I'm also assuming the insurance is going to have huge difference? Please help, I'm a newb. Some of the cars I checked out had an "M sport package" big deal?