Since I have a 2011 PF, I think what I'll do is take it to the dealer every 7,500 miles/6 months for an oil change, and I'll do the in-between every 3,750 miles.
Once I'm out of warranty I'll go with Mobil 1 with an extended filter and change every 7,500 miles.
As for Fram filters, I don't see where they are any worse than OEM. I saw where the Nissan uses cardboard too. I'm not saying Fram is the best or worst, but I've used them in my 2002 S-10 and I've got 105,000 miles with no problems. I use Mobil 1, and Fram Xtended Guard, and change every 10,000 miles.