Drifterman33- For a HU I would look at the 880PRS or something that gives you some eq and processing capabilities to get the most out of it and to do some fine tuning.
You can go with a sub to get that lower end. The trade off is giving up some space, another amp and some additional money that you could spend some where else like in the install department. It is a custom rod so do not need anything to take away from the car itself IMHO. Just something that sounds really good and get's decently loud just to add a little extra draw to rod itself and to listen to while cruising.
IMO SQ does not have to have a sub he is not going to compete in the USAC or IASCA SQ classes. If so he will need more than 1000.00 to do it.