i'm looking to get ride of my one 15" L5 and get two 12" subs. i just can't decide whether it's worth the extra cash to buy two 12" L7 rather then 2 12" L5. there's only 300 watt difference in them. would 2 12" L5's be able to handle a zx1500.1 or two zx750.1? these are the different set up i'm looking to get but i want some input first before i just jump into this.