Stealth boxes are nice but you can get designs on here free with a cut sheet if you know anyone halfway decent at woodworking and do it with 50 bucks. I would get the SSA dcon without a doubt from what you have said and what has been listed even if it wasnt listed I would still get it. and as far as amplifier goes it depends on budget, box and how hard you want to run it, personally I wouldn't give it more than 800rms daily just get a solid amplifier that runs @ 1 ohm. I'd go 36hz @ 2ft^3 with around 14sq inches of port subwoofer upwards port backwards or side firing (this is a hatchback right? if not do both firing backwards.) and run a good 800rms to it. Look into something like AQ, DC, Sundown for high end good sounding amplifiers or something like MB Quart, Kicker DX, Audiopipe etc. for mid-end.
EDIT: on a side note DC, Sundown, AQ don't really make anything less than 1200rms so you might have to settle with something like a Kicker DX1000.1 unless you want power that will never be used and pay a pretty penny for it. Theres more brands out there I'm just much too tired to list them all.