I need help selecting the right program/s to buy.

I am working mostly as an artist/sculptor (mostly-retired architect). For years I purchased the standard Autodesk programs and ran them on PCs but I switched to Mac and now work on OSX Yosemite.

While mostly I work 2D, I am really interested in 3D as well.

I switched to Mac because Autodesk had a version finally. I have found the differences a pain to adjust to (trial version) but I think I am getting there.

My questions:

Should I stay with the LT version and another program to explore 3D (which one?)?

Or do I get the full Autocad and use it to generate 3D?

Should I look at other programs instead?

Everything I do is one-offs, so I do not need a huge corporate interconnection type system. I think I prefer to purchase over leasing.

Cost is an issue but if it is really worth it I will find a way.  I am frustrated by the planned obsolesence that seems part of this, but there I am just venting.

thank you for any input or opinions!

Megan