If you were to go with the P362's, I would just skip the sub, and save that money for a decent sub. The Infinity's have not so bad extension on their own, and a little dayton 120 isn't going to be adding much. It might help just a little, but I would recommend you save your money for a subwoofer that will seriously add to such a setup. Save your money and look at the Hsu research, Outlaw Audio, Epik Subwoofers, and Rythmik Subwoofers. If you really want a good sound, look at room treatments as well, there are a lot of inexpensive things you can do to improve the acoustics of your room.