IMSI makes "Turbocad" which, at about $80.00, is able to work & save in many formats up to & including Autocad 2000. It's easier to use for me (I've got Autocad 2000 also), and will make quality drawings.
The current version (v7.0) also will do 3D drawing, and includes "Floor Plan", which makes drawing & rendering of 3D floor plans very simple.
As you can tell, I'm really sold on this product, and no, I don't own stock in IMSI [Linked Image]