Which free common lisp do you recommend?

[Henna]

Which free common lisp is most widely used?
Which has most user support?
Which has less headaches? and the distribution comes with most tools so I
do not have to 
 gather them from places.
Which is most versatile and allow exploration of most concepts?
Which is easy to install? on redhat linux? 

I am only using redhat linux.

These questions were not answered at a useful site
   http://www.cliki.net/Common%20Lisp%20implementation
and so I ask you.

Installing common lisp would be a major headache for a person of my
capability,
so I request help for my benefit, not as a forum for rivalries. This means
that if you
have a counter idea, please post it and in some detail so that I can make
comparison.
My immediate goal is to get plisp running and if this can be done
immediately with
minimal effort then I would defer a full commonlisp with CLOS to a later
time.

Henna

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