Question: What version of Eclipse do I need for Google Web Toolkit? I see about 7 versions, but none make any references to GWT. Google doesn't mention it to. I did install the PHP version.

Answer: 
Definitely the Java EE version. The regular java version doesn't seem to work with the google plugin.
I suppose you should install JavaEE version.. Because GWT produce a war file, and it should be deployed to a web application server.