can't beat the motorsport wires for like 40 or 50 bucks.i think autolites are a good plug for mustangs and i'm sure a few will agree.don't waste money on platinum or multi tipped or grooved plugs,you'll never feel the difference or justify the price.
Know matter what anyone say's, Autolite/Motorcraft is the only plug to run in a Ford.... plain and simple. There are alot of good wire's out there... My favorite are definetly MSD 8.5's, although Taylor and FRPP do make a pretty good wire as well. Your call there.
Autolite/Motorcraft stock replacements. Period. Unless you have something going on in the way of N20/forced induction, don't mess with the heat range. I've run Motorsport 9mm wires on all my stangs with good results, but I'm really happy with my Performance Distributors Livewires kit right now. 11mm, very cool. Great tune up kit.
Taylor is the only way to go. The ends are smaller than the Ford ones and are part of the wire (one peice). No boots comming off when you pull off your wires to change plugs. Also the smaller boot has a lot more clearence for your headers than the Ford ones so they will run much cooler. I run the 409's on my car but the Spiro Pro's are just as good just minus an extra layer of fiberglass and silicone.
As far as Plugs go I have found better luck with Autolite than anything else for N/A and Denso for a power adder.