Which Scheme interpreter or Compiler do you suggest for learning the language? I will be reading from Dybvigs "The Scheme Programming Language" book (probably the third rather than the fourth edition) and the Little Schemer. I have installed Guile and was considering adding the Petite Chez Scheme interpreter. Another option would be the PLT-Scheme which I did not warm up to in the past or MIT Scheme.
Any other suggestions, feedback or input?