3D modeling software for Windows 7?

A few that firts come to my mind would be:

Google Sketchup http://sketchup.google.com/intl/en/download/index.html

123D by Autodesk: (Although I haven't used it before I've heard good things) http://www.123dapp.com/123D

Last but not least blender: http://www.blender.org/download/get-blender/

try Creo Elements/Direct Modeling Express (formally CoCreate) it's free :)
http://www.ptc.com/products/creo-elements-direct/modeling-express/

I use Alibre Professional right now. My older version 2008 of SolidWorks couldn't read newer design files, so I switched the Alibre. They have a $99 personal design version that you might like. It has a 30 day free trial.

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