Buy a used Nikon D80… I’ve used the Rebel, Nikon D40, D70, and D80.
The D80 is by far the best I’ve used.
Used DSLR’s are usually kept in tip top shape because their owners are into that sort of thing. I picked up my D80 for $500 with under 100 (Yes, one hundred) shutter actuations.
When I was looking at a DSLR for myself, the Rebel XTi was at the top of my list, with the Sony Alpha and Nikon D70 closely behind. My mom ended up getting a D40 for herself though, so I’ve just been using that instead. I really like the D40, and I’ve never found it to be lacking for what I need. I have the kit lens, some gigantic-ass zoom lens (I believe 80-300, I’ll check when I get home), UV filter, circular polarizer and an IR trigger. I borrow my friend’s tripod a lot, but I’m gonna get my own soon. IMO, all you need for amateur car photography.
Oh, I just noticed you didn’t really post what you and your dad plan on doing with it. This setup also works for my mom, who does close up flower photography, as well as various family pics, vacation pics, etc…
yeah i got the rebel xt and its great… i mean im not pro or anything but it takes great pictures and has all the features that i was looking for… i paid $399 new boxing day special at best buy then i bought a lens…