Since I have a 2009 SE with the stock REQ radio, and I really don't want to spend the money to upgrade (about $2k) to a Nav factory radio, I was thinking about installing one of these:

It's an integrated mirror/NAV unit. But I'd like to know if anyone knows if I can tap into any wiring in the front overhead console to make installation easier? Any ideas on which wires to use to get ignition power?