TrueSpace is now free.
http://forums1.caligari.com/truespace/s ... stcount=45
True Space IS a high end modelling program, on the par (reasonably) with 3DSMax. Caligari was recenlty bought out by Microsoft, so this development puts matters into a new perspective.
The *worst* part that I've found is learning the freaking interface. Having said this, I've seen TS work that is absolutely incredible.
Will it be supported by ACES in the form of FSNext SDK tools? That is up for pure speculation.
However, for a modeller, it's a great program.