i got a stroker pro 15 and a hifonics 1608 and want to get rid of them, idk how much yet. then i also want to get 2 re xxx 15s. are these the new xxx's http://cgi.ebay.com/RE-AUDIO-XXX15-15-XXX-4000W-COMPETITION-SUBWOOFER-SUB_W0QQitemZ400005491520QQcmdZViewItemQQptZCar_Subwoofers_Enclosures?hash=item400005491520&_trksid=p3286.c0.m14&_trkparms=72%3A1240%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318 and is that a good price. wat amp would i use to run both