A lot of people use trueSpace and some use Amorphium. Both are pretty good programs, but Amorphium only does organic modeling. I've seen Rhino mentioned a lot, but I think it's a more expensive program. I think Ray Dream Studio (or whateven they're called now, Carerra?) has been mentioned, too. You might even find some good, factory sealed, unregistered copies still on eBay occasionally. I've bought some brand new, unopened software from there for a great price. Just be sure it's fatory sealed so you can register it. Melanie