Finding property owners

Can anyone recomend a good website or resource for finding information on someone who owns a property?
In my particular situation, I have found out the person’s name from the city tax assessor, but the address for them is the address of the abandoned property (believe me no one lives there). I’ve run searches on the net throught peoplefinders.com, but you have to pay for the actual information. Is the information they have reliable? Has anyone else used a service like that?

Thanks,
Bill