Well, if you had the money and space, go with the eight 8's. But since your sub puts out its most @ 2ohms (really about 400watts) go with four 8's, that will give your amp a 2 ohm load and 100watts to each 8...
those 8's seem sweet. L5's are sloppy i hear. L7's are decent subs, but i thinkt hat the 8's would sound better than the L series subs and might even beat them in spl.
lol L5's are sloppy but a S12 L7 with a nice med vented box will bass as much as those 4 eights if that is what u want but if u want SQ then Kicker doesnt make SQ just mad bass but then u have to deal with the factor that the L& 12 takes 750 RMS so that is a prob :[