I noticed a slightly smoother idle when I went to an Accel coil, Magnecor wires, and Motorcraft Double Plat plugs; but saw no gains. Everything was stock at about 50k miles, so the plugs/wires were already on their way out anyway. Honestly, if the OEM parts are cheaper than the aftermarket (not likely) get those. You won't notice a difference; unless you want the pimpitude factor that comes with big ole wires and a shiney coil pack.
2000 Contour SE 2.5L ATX - Toreador Red
2001 VW Golf GLS 2.0L MTX - Tornado Red
Buy my possessed VCR!!