Hey Grim...
thank you very much. Sounds like you know a thing or two about audio. If I may offer my experiences to you. The JL subs are very nice subs but in my humble opinion, tend to be a bit higher $$$ wise than similar products. I used JL stuff extensively in my Porsches because of their form factor. Their 8 inch was a perfect fit for the Carrera.
Alternatives to JL you may want to consider are Kicker's, CDT's or Image Dynamics. I put a solobaric L7 from Kicker in my new Vette (picture below) and it sure thumps. Their square design really packs a thump. I also have used CDT's line of Eurosport speakers in my Porsches and Vette's and most recently experimented with their subs. They sure are pretty and a competition level sub.
If you are into buying this stuff off the 'net, an excellent resource with excellent prices is
http://www.thezeb.com (I personally have no relationship with them, just offering my experience).
Anwyays, enjoy your audio project and drop me a note if you want to chat. (I see you also have a vette. click on my dyno link and take a look at my graph. these cars are a blast and you can really tune them for some serious HP's)
----------------------------------------------------------
2002 Vette; Vortex Intake, Vortech S/C, Stage II heads, comp cam (220/220/114/.581), 3.90 gears, 14 inch cross drilled rotors, 170 stat, NGK TR6, B&M Ripper Shifter, Autometer Boost & Fuel pressure gauges on a-pillar, Hotchkis Sway Bars, HRE 543 wheels (F:265/35 R:295/35), Z06 titanium exhaust, RK LT headers, Magnaflow x-pipe, Programming by Morgan Motorsports, 5% tint, AA Frame & Rocker Savers, TB Bypass, Lowered 2", Custom Audio;570 RWHP
Dyno Here
2003 H2; 37 inch tires, Manik Off-Road pkg., Airaid Intake, Custom Audio