IF you are seeking the Slam (the hit on the cheast) for gunshots etc then you can try the PSA subs. PSA subs are generally known to produce very good mid bass, which are comparable to the legendary seaton submersives. As these subs use PA drivers, they have much better slam compared to other brands. If you feel the new models of PSA to be out of your budget, you can contact Mr.Parthasarathy (Surroundswar) for demo units. The last I spoke to him, he had 2 demo units of PSA V1800. These 18" ported subs are very good at mid bass though below 20hz is not their territory, but still, they will produce more than sufficient low frequency for you. Call him to see if you can demo this sub at his place. When I heard that sub, it was great. So, even you may like that sub.