MagicWorld wasn't originally written to support DBpro, but it still works pretty good, you'll just have to tweak some things to make it work correctly.
If you've got photoshop I wouldn't bother with any other 2d editors, because I know Paint Shop Pro has a feature where you can look at the picture with copies of it on each side so you can see what it will look like on an object, so Photoshop is bound to have what Paint Shop has plus more.
DBPro does have a bunch of models built in, but they may not be what you're looking for. If they are, then no money outta your pocket, but if they aren't then you might want to look into one of the DarkMatters.
Juvenile Industries
Current Project: KillZone(FPS)
Soon to come:An rts, and a snowball fight game