I would say your two strongest ones are USA-ECONOMY.COM and WorldWideBargain.com however most people will automatically add the (s) to the end of bargain. Current value for all is at least reg fee with perhaps the exception of your two strongest ones which may get you just a little over reg fee.
Sedo is not a bad place to start. It will give you sort of a general idea of what people think of your domains. If you do use sedo park them there for a month (30 days) without removing them and it should give you a general census of how well they are doing.