So I have been looking for a good used XC90 for quite some time. I am leaning more towards the V8 in 06/07 but would take the 3.2 in 07. Trouble is, I have passed up many vehicles because they didn't come with the factory RSE (dual headrest) and dvd player in the console or it didn't have the NAV.<p>I was leaning more towards a RSE system cause I can pic up a cheaper GPS unit than the factory one, but then I got thinking about the RSE systems.<p>So, a couple of questions here:<p>1. If you were to choose, would you rather have factory NAV, factory DVD RSE, or dealer installed RSE, both NAV and DVD or neither. I am thinking that it has been too many vehicles passed up cause they didn't have one or both of these options.<p>2. On the Factory installed RSE and/or the dealer installed RSE, is the sound limited to the wireless headphones or is there any way to have the sound played through vehicles sound system. If it is only through the wireless headphones, then I wonder what the audio cluster on the passenger pillars is for.<p>Thanks for any or all of your inputs!