Well, as stated in the header of the forum, "What 3D Program Should I buy?" Not one person here can really tell you what's best for you, as everyone has their own taste in workflow. Try the demo or learning edition of the program you're interested in, this is the only way to find out which programs you like. Having said that, I can suggest a few user friendly modeling programs that you may want to see if you like. WINGS3D, Silo3D and Hexagon. There're also a few complete packages (modeling, rendering, animation)out there that are very powerful but have a slight learning curve like Blender3D, Truespace, and Cinema4D. Ultimately, it's up to you to find a program that suits your style of working, as all the programs mentioned and nearly any 3D Modeling program worth it's code can produce the models you're wanting to make. In the higher price range, there's also Amapi and Rhino, which are two powerful modelers that have respectable scanline rendering. Rhino has loads of tuts on the net (and here) about the subjects you're looking for and those same tutorials can carry over well to Amapi. Again, you'll have to try out a program before you know what works best for you, as not everyone likes using the same interface.