Make it glossy black!
Nah, rather seriously, if you paint it, I'd go for a matte finish, since it won't show fingerprints as badly. Since the case is black, even after sanding and priming I'd suggest a dark color. If you have got no experience on spray painting, there are model kit building tutorials on the web that will show you how its done, avoiding mistakes like orange peel and paint runs.
To repair the screw posts, I'd suggest either brass tubing that you thread by yourself with M3 thread (or whatever the imperial equivalent is). Or try to get some tubing that already has been threaded. Can be glued in place with 2-component Epoxy, make sure you've aligned them properly.
Good luck on your repair job!