I have a Scosche HD3002 amp that i bought at walmart for like 100 bucks. Currently I have it hooked to my two pioneer 6X9'* and it bumps good for not having a sub. However i am thinking about getting a sub, probably a single 12 inch. I've been looking at the Pioneer 12 inch and the Xplod 12 inch, both around or under 100 bucks. I dont want to spend more on a better sub if i wont be able to tell the difference due to my cheap amp. My amps specs are:
80W RMS x 2 channels @ 4
110W RMS x 2 channels @ 2
220W bridged RMS output @ 4
Here'* a link also, http://www.audiooutfitter.com/store/HD3002.html

Also should i spend the money on a nice box or have a friend make one for cheap, would it really make that big of difference even if i was running a cheaper system?

see if you cant find an Infinity 1230w, one of the best budget subs ever

the 1240w is the new model, so if you can get it for cheap, go for it

try to stay away from sony in car audio, they make some nice headunits, (really expensive ones) and nice monitors, but trust me the sound quality is not that great. You can do much better. Infinity is awesome and 1230w'* are really nice for the price.

what if i were to get two infinity 1240'*? would my amp be enough or would i have to get another one? If so would two of the same amplifier that i have now be enough?

the rms is 300 on those and i dont think your amp will cut it if you want 2 of those. It depends on how you wire it too. I really dont know how scosche'* numbers on rms go (if they are low, high, or accurate on the amp ratings) but the main thing is you want to get as close to the rms as you can sometimes over but if you run them too low on power they will not sound as good and sometimes you can end up damaging the speakers. this all depends on your setup too. i would definately say you need more power if you want to run two. now if you got the 1242w you could run an amp to each one and do really well if your amp can handle 2 ohms because you will be able to use more power that way, but if the amps are not fit to stand up to that kind of power, they may just end up shutting off and stuff like that. it all depends, but if you run one 1240w at 220 watts it would be decent but not up to its potential. Im sure its one of the best quality subwoofers for the price though.

Ok so i think my final decision will be to stick with my amplifier and run one Infinity 1240w with 220 rms @ 4ohms. So how good will this sound for being a low budget system? I'm not expecting a lot but i just want some more bump.

I think you will be suprised how good it will sound. Its not going to be the best, but it will have pretty good quality compared to some of the other cheap alternatives you could have gone with. You definately won't be heard from blocks away, but i bet it will sound pretty good in the car. keep us updated.

yeah i think i'll be getting it for christmas so i'll keep you guys updated and give some feedback. There'* always room to upgrade too.

One more question... If i were to get the infinity 1242 dual coil could i wire it so it would provide more power than a single coil? My amp specs are at the top.

well it all depends on the amp just to stay safe i would say don't go with a 2 ohm subwoofer (1242w is dual 2 or 8 ohm), but if your amp can handle the power without getting really hot and over heating, then you could do it. I know with the older RF amps you could run them down and they would get warm and sometimes shut off, but thats beating them up. I would run the 4 ohm that it is rated for. If you run 2 ohms you will get more power, but it will draw a higher strain on the amp and by looking at the specs it doesnt say it can handle two ohms bridged. sometimes if you look for amps they will say one ohm stable and things like that but I wouldn't try it on your amp. hope that will help you out some. any more questions feel free to post or message me.