If you're old enough to remember the Knight Rider TV series, you could name the car KITT. I'm also struggling for a name. You're welcome to some of my rejects:
Wingardium Leviosa (car has smart air suspension)
Bilbo (car has hairy toes...err maybe not)
Hammer
The Flash
Batmobile
NCC 1701
Last Gas 100 Miles (my Xbox gamer tag)
White Lightning (the car is white)
Spook
Stealth Mode
Optimus Prime
White FBI Surveillance Van (my Wi-Fi network name)
Funny you said that, I plan to name mine "K.I.T.T." unless Knight Industry Three Thousand will fit! Decided on this when I finally decided between black on black over blue on black! I cannot wait, although I will have to wait and buy a P100D w/ L in a few years for super pursuit mode!