RE: Which CAD prog if u had about $99 to spend?
Unless you're in need of the latest 3D tools you can buy the recent but outdated versions of TurboCAD for around $25 off ebay. Once you register you'll get regular offers to upgrade from IMSI for good prices.
Learn on the cheapie and if you find yourself doing a lot of 3D stuff then upgrade. Mind you Version 11 or more already has great 3D support.