I use nology hot wires, and after installing them I actually felt a difference(esspecially above 2800rpm..)! AFter whcih, being very happy,a nd subscribing to the "well, now I got a capacitive dicharge wire set...I need to send some POWER through those suckers!" philosophy, I bought the nology racing coil. THis thing is huge, I had to take it to ballanced performance here in GA(a import modification and high-performance maitnanence shop) to get them to fabricate a bracket just to mount the thing. didn't notice much extra power from the coil swap, but I figured it'd be a good idea if I run nitrous or a turbo(or BOTH!) later on.
http://www.nology.com/home.html
side note: almost every modded 240sx seen at BP had nology wires on them, even with a MSD ignition or something, and scott "fuzzy" at nopi uses them on his turbo RX-7... so its gotta count for something
-chet