Bryce has it's own weirdo sides, as in Vue. I have 4.12 Mover and it's surprisingly stable and pretty fast too. When it comes to Mac/PC, and you're planning to use computer mainly on 3D, I prefer PC. Ignore the OS, MacX and WinXP are both stable (XP less, naturally), in 3D you need raw power and lots of memory from computer, and till Mac G5 uses Intel processors (meaning more gigas) it lacks the gigahertzs needed for faster rendering/viewing. Then again, I still use Amiga 500 (5Mhz, 1Mb memory) to play games :D