Originally Posted by Pretender
I-drive is nice to have, but not neccessary on the M3 since it's usually a weekend car unless you're a real estate agent.
If a M3, I'll probably get ZPP/ZSP. If a 335, I'll get ZPP, ZSP, navi.
You will not likely have a choice but once you get an LCD screen / Nav, you won't go back.
I was driving once in another city and really felt like a Dairy Queen milkshake.... Pulled it up on the Nav and received directions in under a minute.