Well, I've been a long time lurker, probably the past year and a half now. I've been doing large amounts of research from every vehicle or build I can find, so not just this site, but others as well.
I currently own a 97 ford expedition, a 04 ford focus zts, and a 92 ford ranger extended cab. Each has small upgrades audio wise but nothing to really boast about currently.
Here are my plans as follows, that I intend to install into the expedition, seeing as its the primary vehicle.
The pc. It's an android based, small form factor board. It's an Odroid XU4. An octocore based system utilizing 2 different cpu's in tandem to create a highly powerful system, a quad core a15 2.0ghz, and an a7 1.4ghz quad core cpu. It only has 2gb of ram, but that's fine as android systems don't require huge amounts of ram. Has a standard hdmi output, one 2.0 usb port and 2 usb 3.0 ports. Also had a gigaport ether net port. Uses a emmc 5.0 chip, 8gb in size(extremely fast over a micro sd card). More info is avaliable at hardkernel.com
I will also be using a 800 x 600 7 inch touchscreen monitor with the above odroid. It's usb powered along with the touch screen input/output. Uses a standard hdmi connection. Also offered at hardkernel. It's open frame, but they will have some sort of case coming out this year.
I will be using a 1tb 3.0 usb hard drive to store media. I will have audio and video on it. Currently ripping my cd's in possession to flac format, and finding sources for other cd's I don't have.
I will be using a usb dac from muse audio for output to a dsp. amazon.com/gp/aw/d/B00FEDHHKE/ref=mp_s_a_1_4?qid=1451840077&sr=8-4&pi=AC_SX236_SY340_FMwebp_QL65&keywords=usb+dac is the dac I have bought and am using now. Works 100% out of box. Plug and play.
Dsp wise, which I haven't bought yet, I'd like to buy a minidsp c-dsp 6x8.
Door speakers, I currently have infinity reference in all 4 doors, but I'd like to change the fronts to an active setup utilizing vifa tweeters and 6.5 inch silver flutes. I have yet to pick an amp, but I think I'll get one to match my subs amp.
Sub stage wise, I like bass, so I need to build my box for my 4x Sundown Audio SA8V2's I already own. The amp for the subs is a lanzar opti2000d. Plan to run at 1ohm with all 4 subs.
I have 0 gauge wire from kunkonceptz and SHCA to use, and I need to pick up a secondary battery. Most likely a large g31 agm or two along with the optima underhood already. Not sure I'll upgrade the 130amp alt just yet. Want to see how a battery setup will do first.
But as of now, this is how I'm planning to do things.