The 13W7 is dual 1.5 ohm. I would run them in series to get a 3 ohm load. The new JL Audio 1000/1 would be a good choice to run that woofer. PPI has a 1600W amp that would work well too.
Since the JL amps have the RIPS system, running at a lower ohm will not help performance. In most cases, running at a super low ohm load leads to hot amps with a shorter life span, GIANT current drwas on the vehicle's electrical system, and poor sound quality.
Running the lowest ohm is not "all that".