the more powerful one easier to sell i think, keep the less powerful one. usually sq subs dont require so much power one. can use the money from the bigger amp to get amp for your components..

used JLW6 mau ka? hehe....

more, something around 700-800W would be nice, i usually look for 50% more rms...

as long as amp not feeding distorted signals to the sub should be ok, but lifespan of sub will be shortened la, i do have frens running amps double the rms of subs, in sq will be ok, not much loud bass, volume also never blast..