I really like the cars - they definitely would benefit from having pixeled textures, though. As it stands, they look a bit too...blurry? It's hard to describe, they look fine, it just seems like they're at an uncomfortable medium between pixeled textures and more high-res efforts...if that makes any sort of sense. The F-15 looks pretty good as well - I get the feeling that it'd be easier to appreciate it if the model was rendered at a lower resolution than what you have here...I think that's where the differences between the texel/pixel sizes and the rest of the model start to look disjointed.
I'd love to see more!