First, you want to get two subs not just one as the performance improvement is substantial. For about $2100 you could get two SVS SB3000 subs that come with software that helps greatly with integration, and they offer a long trial including shipping both ways so no risk.
https://www.svsound.com/products/sb-3000
Or, for a little more $ and even better performance but with no integration software you could get a couple Rhythmik F12G subs…
https://www.rythmikaudio.com/F12G.html
Either way you’ll be in great shape. Best of luck.