Dcon. Hands down the best budget SQL woofer. I have a 12 on a Kenwood XR900-5 (600 @2ohm sub channel). Gains set low and that 300 watts rating is very conservative I think.
I am definitely going to get in touch with the people from Incriminator Audio. I always try to do business locally, and if the LI series can fulfill my needs I will for sure be going with one of those. I may even go with a single 12" driver.