Actually no tuttle, the obj file was 320 megs, and Bryce took about 2 hours to import it then hacked up a lung and froze when I tried to move the model (on a system with 768megs of ram). I believe 3ds is the smallest I can go without losing quality. Even as a 3ds, I still had to do a smooth on the whole model in bryce, which took about an hour :(