How is Clojure? Common Lisp? Racket?

I've only ever used R5RS Scheme so with that in mind how do the main Lisp dialects today compare?

I want to write a web facing application in Lisp to see how it "feels". For the record I don't think I ever had as much fun programming as I did when I was using Scheme and I want experience that clear and concise magical thinking again.

Clojure is disgusting. It takes 10 seconds for the interpreter to load.