stay away from the w7 unless you want sq, RE is awesome but overrated, research!! there are many more companies out there, like atompic, soundstream, AudioQue, MTX, soundsplinter and list goes on, dont be a name brand junkie look into other brands that not everyone and their brother buys!
I reciently heard a JL woofer at 500 watts..it totally blew me away. The guy was going on about how 500 true watts is more than enuff for most people. Personally..the next woofer I get will probably be a 13w6v2.