My favorite model is a 1/24 scale '93 Dodge Intrepid, mostly because it's the only car I've owned that I've also had a model of (I'm still on the lookout for an '87-'91 F-150, but that seems to be the hardest generation to find).

Other than that, it's not mine, but it's in a display case behind my desk at work, so I hope that counts for something, is a 1/12 '06 Corvette. It's big enough that the level of detail is pretty impressive, there's even fuzz in the carpeted areas (it feels like the interior plastics are of the same quality too).