I just installed a Kenwood Excelon DDX7015 in my R32. I bought it from the classifieds here a while ago. It's a little old, but it has changer controls so it works with my PhatBox (after I re-flashed the PhatBox to Kenwood firmware).
Pretty much any double din screen should work. If you buy used just make sure it comes with a mounting cage. If it doesn't check ebay for a replacement before buying.