Deciding on a sub

I currently have a Polk Audio SR 124 SVC 12" subwoofer. It is not particularly loud but sounds great. I am more concerned about SQ. I plan to redesign my trunk and would like to go with 2 or 3 10's.

I plan on a false floor construction in my 2003 Mustang Cobra trunk. The subs will be facing up in the middle of the trunk and powered by a Zapco DC reference 1100.1 amp with about 850W @ 4ohms. Source unit is a Pioneer AVIC N3 navigation system. I currently have a Polk Audio SR6500 component set in the doors powered by a Zapco DC Reference 1000.4 amp.

My picklist is below:

2- Soundsplinter RL-i10's :

pros: great price & reputation

cons: not sure

2- Audiopulse Epic 8's or 10's:

pros: I hear they are similar to the SS RL-i's

cons: a bit more expensive, TC sounds financial situation unknown

3- Elemental Designs SQ10:

pros: lighter, cheaper, smaller, imo the best looking of the 3

cons: slim design means easier to bottom out, read a lot of 2007 posts about bad reputation(maybe resolved now?)

Please let me know your thoughts.