Get a cheap Fedora or Centos box, download SugarCRM v 5.x, and go to town. Salesforce has per-user fees, while SugarCRM does not; it also has a robust community for support and customizing.
It runs using all free software - LAMP stack.
It was either "Kentucky Fried Movie" or "Amazon Women on the Moon" that had a funny skit called Feel-a-vision. An usher performed the 'feeling' part for the patron - the first movie was a detective mystery; the second was announced as Deep Throat (at which point the movie patron ran away at great speed). Someone who remembers it better should chime in with the details - the motto of the decade seems to be "Everything old is new again, this time with computers!"
Work without a vision is slavery, Vision without work is a pipe dream, But vision with work is the hope of the world.
