Frams have the weakest construction and lowest sq. in. of filter element out there. A Fram will not necessarily blow up your engine but there are better filters available for the same money (Motorcraft) or less (SuperTech). Also do not be fooled by the new Autolite filters showing up at Wal-Mart, they're just relabeled Frams.
Castrol is fine for a conventional oil, but go with a Motorcraft filter. Same price as Fram but vastly better.
Quickie primer from BobIsTheOilGuy.com:
Best filters--K&N, Mobil 1, Baldwin
Really good filters--NAPA Gold, Purolator PureONE
Best filters for the money--Motorcraft, AC
Cheap but decent--SuperTech, STP, regular Purolator