Rolls Royce Phantom. Mentioned before, But I like the look of it. When someone rolls up in that you know they mean business.
A sleek, powerful, fuel-efficient SUV? I'd Have to be an idiot to say no to the Dodge Powerbox, since it was all of these things and more. This concept vehicle was introduced in 2001 and was based off of the Dodge Power Wagon concept. It looks like an SUV that you'd expect to see in a game like Deus Ex: Human Revolution, and it's got the tech to fit in too.
Another Concept out of Detroit, the 2006 Chrysler Imperial Concept. Originally marked for production as the high-luxury alternative to the Chrysler 300, it was canned since it was deemed "politically incorrect" by the execs in charge. It had mixed reception at it's unveiling as well: while some liked the design as a sleeker, smoother take on the Rolls Royce Phantom design theory, others hated it, calling it overdesigned to the point where it matched the ridiculousness of Homer Simpson's self-designed automobile. I still like it though.
Right now though? I want to get myself a little 1995 Blazer, since it's got a near-perfect balance of stability, durability, storage space, fuel economy, and off-roading capability in a truck. Growing up in the badlands, I've always liked SUVs, and few have come close to my opinion of the little blazer. Not to mention I've got quite a few wild customization ideas for mine.