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If you were to go with rich00's recommendation of 2 12's on 2k here's just a quick search on ssa's store of budget friendly (using the $1000 you listed) and is good quality. 2 american bass xfl 12's (177 ea) $354 American bass ph4000 amp $260 Sky high ofc 0ga amp kit $115 Total: $729 And this set up should be able to slam. Just to show your $1000 budget is very doable.

A nice value for your goals: https://store.soundsolutionsaudio.com/products/sky-high-80mil-sound-deadener-16-5-99-sq-ft.html https://store.soundsolutionsaudio.com/products/ampere-audio-aa-vibraflex-bs-80.html The Ampere is on sale right now. But keep in mind that is just the CLD tile. You can add CCF and MLV, or try the new Silencer 3-in-1 that is CCF, Foil, and Butyl in one piece.

Ok now this is strictly my opinion. I'm no expert although I have been in car audio since 1996. I would go with 2 12" subs. In that size you want a ported enclosure tuned pretty low. Now for $1000 I can't give specific sub recommendations. I just don't know. I see lots of sundown subs and amps. I would go with a class D amp. Figure out what subs you want then match the amp to them. It looks like you have roughly 13.5ft^3 that before bracing and port displacement and sub displacement. 2 12" would kill with 2k+ watts. I'm not sure if you can buy 2 12" and a 2k watt amp and everything else for $1000. So go look at pricing on reputable subs and amps. Go to the SSA store first and look at pricing. That way you get an idea. Again this is strictly my opinion.