First hand experience:
JL audio: 0,1,3 all sound great but are not very loud. W6 is clean and fairly loud, W7 is loud but lacks definition. All JLs have surrounds that dont last long in humid/tropical enviroments.
MB Quart: Clean deep base but not very loud.
Pioneer: Wouldnt ever use them except the SPL Premiers and they are expensive.
Kenwwod: Suck
Clarion: Suck
Rockford: Series 1 suck, series 2 suck, series three are nice but boomy. T-1s are very loud and pretty clean butneed a big box and are expensive.
Eclipse: Regular suck, Aluminum was nice and the Titaniums were excellent but no longer made well.
Sony: STAY AWAY FROM THEM!
Focal: Best sounding sub if you get the Utopia or better but they are very expensive.
JBL: Good sound for the price but you have to get their top one for real output.
Boston: G2 are ok G5s are EXCELLENT and their oval sub is prolly the best sounding and highest output non-SPL sub i ever installed.
Infinity: Refrence are ok, Kappas are ok but the Kappa Perfects are very very nice and deep. If you can find some old Betas though they are spectacular! Their 8" pounds like a 12" but they havent made them in years.
MTX: They all suck now
Soundstream: Used to be a leader and now everything sucks.
Audiobahn: They made two good subs but I cant remember the series. Same price as a Rockford P3 and the Rockford is better.
Alpine: I always got their levels mixed up but its Type R, S and X. One sucked, one was ok and one sounded really nice but I only installed them in band pass boxes.
Those are the main players. If you are set on a tripple setup under the deck then I would do a ported box that ports into the cars cabin. To fit a tripple ported under the shelf you will need to run eaither a (all 10") JL W3, Boston G5, Infinity Kappa Perfect, Rockford P3 or maybe some W6s