Wings3D is simple for beginners,because you can easily earn there logic, even if you are learning slowly. And then 3ds Max, blender. I personally not like Blender, gui in this program is awful. Just watch some video tutorials YouTube, it's all about imagination.
I will look into it, I used to have Sculptris, Daz studio and Houdini before windows crashed on me I just havent reinstalled them yet. Are these demanding on hardware? I have 12GB ram A Radeon 4200 and a Phenom ii P960