Got reversing camera installed as well. Looked at the GPS module, but it's $1700 (bear in mind the head unit was "only" ~$500), so I think I'll continue using Google Navigation on my phone (I just wish that Android handled playing music and other audio sources at the same time nicely - it's the ONE thing I miss from my iPhone)
Was contemplating that being my next upgrade when my Headunit starts to become outdated. Looks good in the RX interior too 
