AutoCAD on iMac

Hi to all. I have an iMac Intel 2.4GHz and 2GB Ram and i have been running AutoCAD on Windows for couple of mounts but lately I've been experiencing problems with it. It became a lot more slower and when i have to copy something from an other document i have to wait at least for 3-4 mins while on pc it takes me several seconds. For the last 2 or 3 weeks I've been planing to transfer my work on Mac OS but there isn't AutoCAD for Mac. So can anyone recommend me a program that can replace it. Thanks in advance.

Try ArchiCAD for Mac. It is not cheap ....

http://www.graphisoft.com/products/archicad/ac11/

VectorWorks; great interface, nice renderings

Thanks a lot. Maybe I'll go for VectorWorks because the interface is better and it has visualizations.