lolz, thanks. good lookin out domo. As he said, my lvl3 pound the shit outa my car. With the amp you have now lvl3s are perfect for you. However like it has been stated, if you can afford to grab a pair of lvl4s then do so. You can run off of that amp of yours and still do fine and when the opportunity arises, upgrade to a bigger amp for more power. Simple. But yeah....DCs will eat those type Rs....and I like alpine lol....but DC FTMFW!
EDIT: btw, my set up is tuned to 32hz with a total volume of 3.04cuft so your box should be fine. Is your new box ported? sure hope so. Send rusty a message so you can get some pricing. You can go from there and decide what you want to do, 3s or 4s. Good luck and keep us updated!