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 doors. 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 an 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 have chosen wisely or not. LOL