I want to upgrade my system to something with deeper hitting bass but want to stay around the 1000-1300rms range. [Right now, I have two 12" Type R's wired to 1 ohm at 1000 watts rms with a Cadence amp.] I'm thinking about either upgrading to a 15" Fi BL with all the options or a 15" Lanzar OPTI1532D. Does anyone have any suggestions for what I should do?