I downloaded a lot of different trial to test wich software meet my needs : cinema 4D, Maya, Lightwave products and Strata. I also looked at cheetah 3D.

Strata 3D was the best (for me) with it's interaction with photoshop. While some aspects are perfectible, at least this software look like a mac application. I use it to create objects mostly (i render under Vue infinite wich is fantastic at this job).

Cheetah 3D is also a great software but lacked some features (but i'm considering buying it too).

Note that i use version 5.6 wich seems to have corrected some bugs since version 5.5