I'm just venturing into this myself. Any program that exports into ".obj" format should fit the bill. I'm using LightWave, which comes with plug-ins to import/export .obj files. 3D Studio Max also requires plug-ins for .obj support. I've seen many tutorials mention Ray Dream Studio, and it supports .obj files "out-of-the-box." I prefer LightWave because they simply labeled each tool/function in text rather than fancy pictures, and it's a very powerful program in it's own right. There should be demos available on the web for above-mentioned, I can only recommend finding an interface that you're comfortable with.