I've tried many plugs on my car... TR55, TR6, AC RTL, etc etc... i've had the best luck with the Autolite plugs.
I run Autolite 103 Coppers @ .050 w/ basically a... MSP CAI, 4" ducting, HVTB, TB spacer, Ported S/C, PRJ IC, Machined LIM, 3.0" DUB, 1.9 Rockers, CC 105# springs + Ret, TOGs, 3" exh, Overkill Custom Tune, Volt booster, Alt Rewire, Lucas 42.5# inj, Fuel Pump Rewire.
In my GFs car I run Autolite 104 @ .054 w/ basically a... Thrasher CAI, ILGPC IC, DUB 3.25", JimmyC 3" Catless DP, Overkill Custom Tune, Volt booster, Alt Rewire.