Regarding the 'unique' dilemma you two face (sorry I couldn't help myself), I can see both sides. The thesaurus lists these other words with 'unique' which make an interesting point about the shadings of the word.

sole
only one of its kind
single
exclusive
exceptional
inimitable
distinctive
matchless
irreplacable
rare

antonym: common

I would say that in regards to the Hummer H2 'distinctive' may be a better descriptive choice. After all, how can something that is mass produced really be unique? Perhaps the design can be, but the vehicle cannot.

-Zeke