Hi Mark. I use Solidworks day in day out for work and it's by far and away the easiest 'professional' 3D system to pick up. I've only used Draftsight as a 2D viewer, but with its similarities to early AutoCAD 2D versions I would imagine the 3D capabilities are very limited and also fairly difficult to work with.
If you want to contact me on facebook or drop me a PM, I might be able to arrange an 'evaluation' version of solidworks, or I think you can get a limited time trial version from the website.
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