You get what you pay for man. IMHO it is worth it to save up and spend a little extra to get quality equipment and do it right the first time rather than trying to be cheap and skimp a few bucks and then be disappointed with the quality. The problem with a number of cheap quality decks is that if they do offer aux inputs you have to crank the hell out of them (thereby destroying the deck's onboard amp after repeated use) in order to get decent volume out of them. You definitely aren't going to find something that suits you needs for less than $100. The other thing is that you are going to need a deck with dedicated subwoofer outputs, so you can control the subs from your deck.