Ty,
I am pretty sure that you can only get Solidworks for P.C./Windows based computer, therefore you could not run it on a Mac. I have a similar laptop and was looking into an AutoCAD program myself.
Here are a couple of sites that I had book marked.
http://www.architosh.com/
http://www.csi-concepts.com/index.htm
http://www.apple.com/downloads/macos...index_top.html
I really couldn't find anything that fit in my budget ($0), but good luck finding something.
Thank you,
Jason