AngiesList.com has been a great resource to me to find different contractors to complete work on my home.  It provides immediate references from homeowners that have used the contractor before.  They are able to grade them (A,B,C,D,F) as well as leave written comments, type of job done and many times the homeowner includes the cost.  This really helps in narrowing down the search and references from other homeowners are invaluable. 

Give it a try!   www.Angieslist.com