It is pretty much a nightmare trying to pick one. I think first you want to decide what features on the head-unit are "must haves" - mine were Bluetoof, USB, iPod input, SSD card input, CD/DVD player, and Satellite Radio. Pretty much the full boat sort of thing, but I want lots of choices since I'm fickle when it comes to what I listen to. I also wanted a volume KNOB. Touchscreen is fine for most things except adjusting volume. With the knob it's amazing how much I actually do adjust it, I doubt if I go more than 10 minutes without tweaking the volume. It's easy to do without looking and being distracted with a knob... trying to do it on a touch-screen requires looking at the screen so you're instantly distracted.
I'd spend some time with Crutchfield. They have compatibility guides and pre-made wiring harnesses that make a swap fairly easy. Since you have the Bose option, there is one issue - you have a fiber loop audio interface going to the amp, and without an adaptor from fiber to wire it just isn't going to work, and the adaptors are rather pricey.
BTW - when you have a chance - please visit
New Member Introductions and introduce yourself and brag a bit about your car - some photos would be nice.
Please update this when you do decide and let us know what you get and how it works out..