The Tourer was a Classic with extras for touring, bags, windshield, maybe luggage rack and back rest?.... The Classic is a Standard with different handlebars which pull back a bit at a further angle, and it has the driver floor board set-up. Classics usually have two tone paint, but not always. The Standard came with single paint color, pegs instead of boards, bars are more perpendicular to the bike and more a reach forward.
Is that about it, guys?
The Roadster has pegs, and the whole set-up has been moved back about 5 inches and down an inch or so, more upright style, improved suspension, and I hear both better power and less power. Not sure about the bars.
Touring was redesigned for touring from the swinging arm back, has slightly different wheelbase, narrower tires for better handling, and I hear they are slightly detuned.