yea, i am a big fan of JL stuff as well. have owned every one of their subs except the W7 and their slimline ones. threw almost 750W at their 10W0V2 and it took it like a champ(thing is only rated at 200W i beleive). in the end the tinsels broke and JL gave me a free replacment even after i told them the abuse that the sub had taken. now the W0V3 has woven tinsels. if i was rich i would buy JL stuff end of story, but you can get better for what their stuff costs.
if you insist on having 4 W7s in your trunk i would go with 8W7s. they are probobly the sexiest 8" sub you will ever find and they sound **** good. you can save a good chunk of money on amps and subs and you can run a ported settup instead of sealed.
Matt