With the money and time involved, I'd rather just go with an aftermarket Navigation.
I am actually about to install the rest of my JVC KW-NT800HDT. It's the first time in my 10 years of doing car audio installs, to go away from Pioneer. I originally went to go buy Pioneer's flagship model Navi, but the owner of the store asked me how important Live Traffic was to me. I told him, VERY IMPORTANT, as I lived in Dallas at the time and soon will be back. He told me I'd have to buy a seperate brain, but the JVC has Live Nav-Traffic built in with a lifetime subscription. I was warry, but I decided to go with it as he told me I could always return it. I couldn't have made a better buy.
That was about 8 months ago. I totaled my $38k Sierra with it in and the JVC Nav was damaged. I sent it in and they just flat out replaced it with a brand new model instead of repairing. Never had any car audio equipment that had that level of service. Price has dropped on it too. Great deals are on the internet.
I GOT MORE SPEAKERS THAN YOU. 2004 Armada SE 4x4 Fully Loaded, Bilstein 5100's, 2" Rear Lift, Towing Package, Leather, Power Seats, Auto-Air, Rear Parking Sensors. Rockford 3Sixty.1 DSP, JVC KW-NT800HDT, FRONT: Focal Utopia Comps powered by Audiopipe AQX-360.4 Bridged @ 320wrms x 2, 2nd Row: Focal K2p Comps powered by Bangs & Olfsen ZED Audio 4 Channel Amp Bridged @ 275wrms x 2, Center Channel powered by Phoenix Gold Tantrum 500.2 @ 175wrms x 2, FOUR RARE Sundown Audio SA-8 V.2 w/ SSA internals, 3cuft ported box @ 31Hz, 2 Audiopipe AP18001D's 1800wrms x 2 (3600wrms) XS D3400 Battery. 4800wrms