As of 12 the student version is a full Design version which includes the Spotlight, Architect Renderworks ect......You can't buy it as a student version of Spotlight anymore. The proffesional version you can buy just the plug ins you want for a cheaper rate or the full on Design version.
You really do want the full Design version because you'll have a lot of symbols that you would otherwise have to draft both in 2-d and 3-d yourself.
Its cheaper to get the student version first and then upgrade later on when you're a proffesional.
Like Van said buy it through who Nemesteck and whoever they suggest.
Any
Vectorworks questions you have I'd be happy to answer if I can.