budget amp subs box & rcas

ok well i just bought an 86 camaro with a TPI 350 and a 700 r4 trans, i love it but back to the matter at hand.  i blew most of my money on the rest of the stereo, i have a pioneer DEHP8500MP reciever, infinity kappa 4x6 plate speakers, and infinity kappa 3 way 6x9s, after this a cam, fiberglass hood, posi, gears, disc brakes, a shift kit, and a chip i have only about 500 to spend on my low frequency stuff, can anyone tell me some good budget entry level subs (or sub) that will give me a nice frequency range, good sound quality and handle decent power, and an amp that puts out 500-700 watts RMS, i was thinking about audiobahn subs but i hear their SQ is less than desirable, so at the momeny i am leaning towards a 15" kicker comp VR, still undecided on amps, i want something with a subsonic filter, preferably a class D mono amp but anything will do

as far as boxes go i was thinking about fabricating one but they always turn out really heavy, the last one i made for 2 15"s ended up weighing close to 100 lbs with the subs in it, i want to keep weight low on this car, (it runs low 13s, and i want to keep it that way) so i was thinking doing maybe only a single 10" in a pre made box i dont know any suggestions are welcome

thanks in advance, either respond or email me Punkrawkershow@hotmail.com

You could try your hand at fiberglassin a box, there are some great tutorials on the fiberglass forums.  It seems pretty hard to do but it really isn't, couple weeks ago i made my first pair of kick panels and they came out excellent. 

i have a sony XM1600GSD left over from my last car.  its 1 ohm stable and puts out 1000 rms at 1 ohm but iw as thinking about selling it to my friend for his suburban.  i cant order anything from ebay as i dont hav an account anymore, i got banned for non paying bidder warnings, and the last 2 things i ordered of ebay didnt work, and i never got the third one