So I went ahead and got the Rockford prime 12" DVC 2 ohm model, a wet sounds SYN-DX6 6-channel amp, and a pair of MB Quart 8" tower speakers. I'm going to take your advice and run 2 channels for 4 stock main speakers and 2 channels to the tower and bridge up the last two for the sub. I got a deal on the amp and it's a bit overkill but I figure I can always keep the gains low. Thanks again for all the help and advice.