Try Solidworks. If you're a student you can get it for like $100 and $200 w/ COSMOS, the Finite Element Analysis software. If you're not, a personal copy is 3-5k for the base version and retails for $27k for the full COSMOS version.

You draw immediately in 3D and its extremely powerful in terms of how quickly you can get the basics. Getting good still takes a while but the results are absolutely pro level. You can add SolidCAM(another 6k retail) to it and it'll generate machine code directly for a mill or you can just send the STL files for rapid prototyping.

It's really expensive if you're planning on doing real production on but the power you get is well worth the cost.