Don't really know what the rarest one i've ever seen is. But here are some rare ones (here anyway) i've seen/heard before.
- Ford GT40 Race Car (my Dad has driven a road car

)
- Ferrari 512M Race Car
- Ferrari 360 Modena (red)
- Ferrari Testorossa (red)
- Ferrari 550 Marenello (rare silver right hand drive version)
The above three Ferarri's are about 15-20 minutes away from here (at the most) with the 550 being about 3-4 minutes away
- Honda NSX (red - in showroom)
- Ferrari 308 (? - saw when i was in Queenstown)
- Chevrolet Camaro Z28 ('97? - black)
- Chevrolet Camaro SS ('98? - black or silver, can't remember)
- Dodge Viper GTS (red with white stripes)
- 1971 (?) Nissan Skyline C110 (one of the guys from SDU owns it)
- Various Honda S2000's
And there's plenty more cars i've seen but can't remember them at the moment.