Hexagon also does twist/bend, etc. Also not all that expensive. I have Hexagon. I use it. I like it. It gets the job done ;). And, like Silo, it will not render anything...you have to export it to something else. But then it's only a modeler and with programs that are just modelers (no rigging, no painting, etc) you won't normally have any rendering capabilities. You need to step up to the bigger packages like you were originally planning.

Laurie