just wanting some advice on choosing what kind of spark plug to use... i just want something somewhat inexpensive, but that will also be a good set to put in (if a such thing exists).. i found some platinum plugs (NGK G Power Plugs), are these good plugs? or could i even maybe go a little cheaper possibly?. they're $2.59 each, which is somewhere in the middle as far as price goes.. what are the main things i should be looking at when buying spark plugs? theres just too many things to look at..