hi, I would like to suggest Alibre (Alibre Design - the best choice for 3D CAD software. Powerful. Easy. Affordable.). It is within your budget, and it has everything you need for a hobbyst (and professional I would say) use. It has the free Alibre Express so that you can figure out how the program works before deciding to buy it. There are some tutorials included there to get you started. Good luck.