I'm looking for an upgrade over my previous setup, which was 2 12 w6v2s with 1200 watts in a 240sx. I now have a 2003 mustang. I have a concept 2400d which puts out 2400 watts at 1 ohm. I am looking for something of comparable sq to the w6v2s with more output. Any help would be greatly appreciated. I also have xr rears and am going with the pro60s or jl c5 in the front if that helps at all. I would like to spend under $800 on the actual sub or subs and am willing to buy used. Thanks