I disagree about the terrains in Bryce very strongly. If you want one terrain for your entire world then go with Mojoworld (great) or Terragen or somesuch. Bryce is simply a different way of working which I've grown to like. (1) it's easier to get more interesting textures by using several terrains. One terrain over your entire world and you're stuck with one material and/or post processing in Bryce. (2) It's nice to build your features in your world instead of relying on one perfect heightmap. You want a cliff over there? Use a separate terrain and have total control of it. I used Vista Pro since its inception on the Amiga and it took me a while to get used to the differences when I picked up Bryce. But now I can't even conceive of going back to a single terrain to depict my world. (except, of course, in Mojoworld which is a totally different approach)