In my opinion, plug wires are one of the last things in the performance arena you want to look at for near stock stangs unless you're going for a whole new ignition system.
If they just need to be replaced, I'd go for the FMS 9mm wires, They deliver a good spark and are pretty sturdy.
Be advised, if you're going from 8mm wires, you may need to "adjust" the wire looms to hold the larger diameter wires. I just bought some aftermarket FMS looms to take care of the issue.
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"The Yellowjacket"
1998 Mustang GT
13.97@103
"Traction Impaired" or "Nitto Needy"
"They think they can make fuel from horse manure.... Now, I don't know if your car will be able to get 30 miles to the gallon, but it's sure gonna put a stop to siphoning."
- Billie Holliday