For plugs go with Motorcraft.
Or Autolite...Same thing.
There's a lot of junk out there in the automotive aftermarket. Your best choice is going to be OEM or a very comparable equivalent. Avoid anything that brags that it's going to give you more power, better MPG, etc. It won't. Some examples are Bosch Platinum spark plugs, any type of "spiral" or "ferro core" or other fancy label on a set of plug wires. The OEM Motorcraft wires are fantastic, and hard to beat. They're also priced competitively to the decent aftermarket brands. The only aftermarket brands of wires I'd trust are the Carquest premium line, made by Prestolite, and NAPA's Belden Max line. The rest are mostly garbage.
One brand of performance wire that I really like is Magnecor, but they're ridiculously priced. A set of the Magnecor KV-85 race wires is $147.00 for a Gen III 4.0 SOHC! They're also gross overkill for daily use. If one was running a hotter coil then they'd be the only thing I'd recommend, but again, a hotter coil for street use is also a waste of time. Save the ignition upgrades till they're needed, like when forced induction or nitrous is added.
As far as PCV valves, etc. goes...Again your best bet is OEM parts. Lots of the aftermarket parts such as these will fit, but not necessarily match. I ran into this with PCV valves on the GM 3800 V6 engines...I tried a Purolator PCV valve in one, and it idled rough, and I saw my fuel trims jumping around all over the place when I scanned it. Something that seemingly simple would make or break one of those engines. That lesson learned, I rarely buy aftermarket PCVs for any late-model vehicle I work on.
Edit: I don't think you can even get an aftermarket PCV valve for the late-model 4.0 SOHC engines. Interestingly, there's an electrical connector attatched to them! I searched everywhere, and although it mentions the electrical connector in Mitchell OnDemand, it fails to say what it's there for. (Anyone? Anyone?) It does mention that any time the valve is removed it must be replaced.
I haven't found a whole lot of difference in fuel filters, but I avoid Fram filters in general. The quality of their oil filters makes me question the quality of the rest of their products. I'd go with a Wix, Hastings, or genuine Motorcraft filter if it were my vehicle. I've got a Wix (Carquest) fuel filter in mine and it's fine. Matched OEM perfectly.