You can in fact retain your Sync, I have done this in my 2010 F150, with the following http://www.sonicelectronix.com/item_...o-MS-FRD1.html. These people were most helpful in the entire process. They do have the harnesses and face platesfor what you are wanting to do.
I ended up with a Kenwood DDX 616 with BT. I got it pretty cheap after a ton of research. I liked the sync and was going the route of retaining it but I was sick of sync not "hearing" me with windows down or people talking. I got an Axxess SWI box the auto syncronized with my steering wheel buttons, no lag like the other brand. A nice plus was that I am able to play video off of the ipod so now I just load it up with digital copies of movies and no more dragging dvd's around. Also it is expandable, you can add what you want, HD, Sat, Navi ect..
2010 F150 STX Scab 4.6 3V, 6Spd, 3.73 LS diff, SCT X3 with 5 Star custome tunes, Bilinvic retrofit HIDs with FX heads, SGM buckets, flat black orbit shrouds, Morimoto 5Five ballasts, 5000k 5Five bulbs, and Evox-R projectors, Auto headlight mod, added TBC, Kenwood DDX 616 with rear cam, SGM Scorche HU surround, Infinity speakers x 4 and Sound Ordinance sub, Nitto TG 275/70-18s,
I see. It have its own mic for the BT or use syncs? phone button still work for its bluetooth or you gotta hit a button on the screen? Ive never had any problem with my sync except when using a crap ipod, switched to flash drives and fixed that problem. I never had to voice train it either. Could you retain sync with that deck? it looks to be decent and fairly cheap compared to the stock nav system. If sync would work with it might be a good option for lots of people who want an upgrade.
2010 F150 Lariat Screw 5.4L 4X4 3.55 LS rear end 6.5' bed with side bedsteps, Sony sound w/Touchscreen nav, loaded. Mods/Addons: AliArc Grill Guard, Stampede bug deflector, EGR window shades, Ezee down tailgate assist, Amp Research tailgate bed step, Mirror reflectors to turn signals, Truxedo Deuce cover, Underseat storage box, Recon Extreme Scanning Tailgate Lightbar, Gotts mod, LED Smoked Tails, LED Lighted F150 Door Sills, 24" Helos