Clinical One is a good company according to travel nurses I met.
AVOID AMN............. Check out RN Network, Medical Solutions web site for their job listings. Cross country is pretty good and has alot of jobs.
Make sure you really feel comfortable with the recruiter because they make or break the assignment.
Take your time and READ the contract before you sign it, every line, and make changes if need be. And keep asking us questions. You want to have a fun assignment not a nightmare