Ditto to all (any SLR, but if I were looking now, I'd look at mirrorless). For me the main advantage of the mirrorless would be form fact, but if you're mostly doing lightbox shooting is probably not an issue.
Just to add, based on what your use case is, I would probably not spend a lot on the body, but would go low-end there and spend money elsewhere, such as...
1. If you want to be able to have a really narrow depth of field, buy a fast lens. You can get an f1.8 50mm for pretty cheap and that will let you get quite a narrow band in focus with everything in front and behind blurred out. Below f.18 they get pricey fast, but your depth of field also gets ridiculously narrow unless you have a specific need.
2. If you want a long depth of field, spend your money on lighting so you can shoot at higher f-stops
3. If you want to get really zoomed in on small objects, get a macro lens.