I am in the process of upgrading the system in my 02 Yukon. I chose a Pioneer AVH-521EX DVD head unit and Alpine S-S65 speakers in all 4 doors. Components in the front and matching 2 way speakers in the rear door. For the sub woofer, I am going back with another 8" shallow unit that will fit in the factory position. After reading about the short comings of the factory amplifier (Non Bose), I decided to resurrect one of my old amps and put it under the second row seat. It is a older PPI4400 from the 90's. It still works great, so why not. After everything is installed, I'll report back with the results. I set a modest budget for my old truck and am happy with the components I have selected. Time will tell if I chose wisely or not. LOL