I use Truespace as well I don't really care for the interface to but it does a pretty good job, I don't know anything about lightwave ( way out of my price range).I think Caligari has a special going on now for TS 3 and 4 so it might be a good time to buy . If you do get Truespace 4 I would recommend the Thermoclay and Blend-O-matic plugins both by Mente Magica ( you can find thier link on the caligari home page under plugins , commercial plugins.