Inventor 2013 or 2014?

[magnets]

I'd actually recommend 2013. Autodesk isn't known for having polished first releases on their software, and 2014 is still pretty buggy for me. Importing our 2011 robot step file into 2013 takes 15 seconds. Importing the same file in 2014 takes 5 minutes. On the school computers, we have graphics issues, and when under load (zooming large assemblies, placing huge assemblies...) it locks up quite often.

The new features of 2014 aren't really that spectacular, and if you can live without them, I'd stay away from it.