There are a lot of free models on the web in .3DS format that will import into Swift. If you're looking to do something more extensive, then any package that exports to .3DS (or to a format that can be converted to .3DS) will fit the bill.
You might get some other good recommendations in the sub-$1000 range - I've heard good things about TrueSpace and Hash Animation Master. My direct experience is sort of at the other end of the spectrum, so take these recommendations with a grain of salt
Good luck and have fun!
[Edited by theMatrix on 10-01-2000 at 12:37 AM]