Best filters: Mobil 1 and K&N.
Best filter for the money: Motorcraft. NAPA Gold and Purolator PureONE are good too.
Normally I use Motorcraft filters and Mobil 1 but right now I'm trying Pennzoil Platinum synthetic ($5 less a jug at Wal-Mart) and will get a used oil analysis to see how that compares with Mobil 1.
If you look at the UOA's a www.bobistheoilguy.com you will see that the 4.0 SOHC throws off a lot of iron. So far I got my lowest iron readings with Mobil 1 5w-30. M1 0w-30 I used in the winter was actually worse.
Like TomT said, if you change the oil every 3000 (and I'd say up to 5000), it doesn't matter much what oil you use.
Being picky, I usually use Mobil 1 changed every 5000.
If you really want to know, get some UOA's. Anything else is just speculation.