Wanting to add a sub to my '98 Cavalier. I dont want to spend a lot of money or give up a lot of trunk space. Should I go with maybe a pair of 8" or a siglee 10" or 12" I am trying to save a much space as possible and would like to go with a single 5 channel amp. I was considering the Arc XXD5080 as it is a very small amp and provides enough power to run the 4 speakers, but only 200 watts at 4 ohms for the sub. Im starting to think this may not be realistic but was hoping to get some opinions on which way to go. I don't mind used equipment if it is in good shape, and I haven't decided to either go sealed or ported yet.