Hi,
You may want to check out Space Claim, as well: I think they also have a trial version, and the purchase price is far less than SolidWorks. Space Claim works a lot like SketchUp (i.e. it is easy to learn and "tactile"), and it is a true solid modeler.
3D Direct Modeling software for conceptual engineering, CAE/Model preparation, and industrial design from SpaceClaim