Ok so i have a directed d1200 amp on a 15" fosgate p2d2 wired at 1ohm . Sounds great , But i want more . Im looking at getting a new amp and another 15" . I can swap the 15 i have at the shop for what ever ohm i end up needing . I would like to stay at 1 or 2 ohms . Heres some amps im looking at

Oh i forgot to mention i have a tiny 1999 chevy cavalier 4 door lol
Ive done the big 3 with 4awg and have 4awg ran to trunk with distribution blocks ect ect .
Thoughts on these amps welcomed and if i should run another battery in trunk since i have a stock alt. Under hood battery is only 695cca

ROCKFORD FOSGATE R500-1 PRIME (one per sub )
LANZAR OPTI2000D Optidrive 2000W (heard good things about the opti models)
LANZAR HTG157 ($90 on ebay seems to good to be true )
SOUNDSTREAM Tarantula Mono Block TX1 (is soundstream Any good thesedays )