When I go to sell it will I need to find out which model exactly or are they all the same?
Since the car is factory sat radio will I need to remove anything else for the sat radio or should I leave it and buy a sat ready aftermarket head unit?

 

The head units (in the US) are all the same - sort of. Yours is the later version with the knurled volume **** that plays MP3s, whereas the 02-04 smooth volume **** models do not. The sat. just plugs into the back. Ebay is a good place to check pricing. I'd say $100 +/- $25