Oil filter ratings are a matter of intense conjecture. There is a well documented study somewhere on the Web that severely pans Fram, Champ, Pennzoil and other "low-end" filters. The study praises Wix (aka NAPA Gold) and several other more expensive filters. The simple reality is that many different brand name filters are made by the same manufacturer, like Allied Signal, using the same technology. In summary it could be said: "Cheap ain't good, and good ain't cheap."
That being said, I've used Fram filters for years and have never had a problem. I've run several of my Fords to nearly 200K miles with never and engine problem. The key in my mind is the FREQUENCY of oil changes. I religously change the oil and the filter at 3K. I actually enjoy getting under the car because I also check other things while I'm under there.
If you don't like frequent oil changes and want to go long miles in-between, go with a more expensive filter like a NAPA Gold 1515 made by Wix. I seriously doubt wheter the new more exotic filters, like K&N, are worth the money. There is a lot of hype and misinformation floating around regarding the subject, much of it motivated by marketing considerations.