Best way to research potential properties in Pennsylvania

[Jeffrey A.]

I have decided to target 20 or so towns in Pennsylvania (several counties) I want to purchase property in.  Is there an online, paid or free, system that I can input the 20 town names and then filter to locate parcels over 5 acres?  I've been manually using the municipal GIS Mapping and Data service, which allows me to manually zoom in on properties and determine the owner, but I would much prefer to be able to filter the info first for parcel size over 5 acres and THEN use GIS to tell me the owner, parcel size, address, tax info, value, etc.

Thanks