If you're going to be investing a large amount (50,000 to 100,000 plus+++) I would definetly recommend contacting
http://www.jumbocdinvestments.com/index.htm They have a rate page listing their top CD rates, now they aren't the actual banks themselves, they just provide you the service of finding the best rates and helping set up your cd at the bank you decide. Right now they show that their best rate is a 61 month rate at 6.00% (apy). Go to their site for a complete list of rates if you'd like! :)