I just recently changed my spark plugs from autolite plats to ngk coppers. this really isnt a wtb but i figured this would help some assummming walmart plugs are a good idea, ill have some pics soon, but the autolite were gapped at .44 when i installed a few months ago they were pulled this weekend to find out they were so bad the gap was .56 or so, plus burnt to all hell. Do not buy them. Now my car sings instead of sputters. 
i have ngk plugs in mine too. they work great, though the bosch platimun plugs also did wonders on my old 88 corolla hatch.