can we talk plug gaps?

i just dont know wich brand to go with, thinking ether taylor thundervolt 8.2mm or taylor spiro pro 8mm or crane's 8.5mm fire wire or some black msd 8.5 mm super conductors. the msd's are around 80 bucks the thundervolts are around 60 to 65 the spiro pro's are 50 to 60 and the crane fire wire is 50 to 60.