I just LOVE, I mean ADORE bryce for rendering and scene setup. Modelling, not so much.
Perhaps because I'm biased with coming from autocad world and used to working with coordinates and math junk, bryce feels too constraining.

But also, I'm thinking, if you're making something for poser, and you need to push around some vertices to fit a model to a character... You can't do that in Bryce, at least not in a very quick and direct manner where you grab a few vertices, and move then where you want them.

I just bought hexagon, but didn't find time to install it yet. Been demoing z-brush, and really like it. If you're planing on doing a fair amount of modeling, I'd go with what Agent smith suggested. In my experience, after a while Bryce gets too constraining.  But, if you don't want to get into a lot of modeling, bryce just might do the trick for you.
HTH!
Hugz, Connie

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
BadKittehCo Store  BadKittehCo Freebies and product support