I think I may just get a sub amp and new head unit for now as the internal amp from the new head unit will probably help the speakers a bit and they're really not bad for stock. I'll worry about speakers once I get a little more familiar with things.
One last question is should I get the dual 1 or dual 2 fi Q sub. I'm probably gonna get the power acoustik amp as suggested, so does that mean I would want to go with the dual 1 option? Ohms are still confusing me a bit. Someone just help elaborate on this for me (as to what exactly each option means and what I want in terms of an amp for power/ohms or whatever else) and I think I'm done bothering you guys with stupid questions for a while until I got a better grasp on car electronics lol.