Processor: Bought open box from micro center. Pleasantly surprised when it worked without any problems and runs fairly cool to boot.
Mobo: Looked around for a bit for the cheapest mini-itx w/hdmi board I could find.
Memory: Bought the cheapest 4gig stick at the time. I plan on eventually putting in another stick.
HD: it spins
SSD: I realize these are not the highest performing ssds but for 40 bucks I couldn't pass it up. Definitely makes a huge difference in boot time and general os "snappiness"
Case: Also bought this open box from microcenter. One of the side panels was a little dinged up and there is leftover tape goo from being wrapped up in a warehouse that I need to work on to remove, but other than that in good condition and no missing parts or screws. I'm on the fence about my decision to use this case. Fantastic build quality and incredible ease of use. Honestly makes me never want to build in a cheap case again. But on the flip side it is a little large for an htpc and the handles make it even bulkier than it needs to be. tl;dr awesome case not sure I should have used it for an htpc.
Power supply: this is the actual power supply (http://www.microcenter.com/product/399332/600W_Modular_Extreme_Power_Supply_-_Refurbished) that I bought but it was not in pcpartpicker's database so I just put in the other one as a filler. Been awesome so far. Definitely enjoy the modular aspect although it was a but of a squeeze into the prodigy. Obviously major overkill for what it's currently running.
Wireless adapter: works perfectly. Got the cheapest one I could find because I will be getting google fiber in the next couple months so I definitely plan on running some ethernet to it after that.
Keyboard: A great deal for 25 bucks. Does exactly what I needed it to do.
OS: Got a free copy of windows 8.1 as a student.
Software: currently running xbmc with couchpotato, sickrage, and maraschino. XBMC is great because it is completely controllable through an ios app which makes it simple and easy for my wife. Setting up the software side of things was pretty dang frustrating, especially with minimal experience with sickrage/sickbeard which is not at all intuitive. Although now that it is actually running smoothly it is really satisfying.
I've thought about eventually putting an i3/5 in it paired with a 270x/280 to run a little steam bpm. But really I have no need to use it for gaming other than to be able to game from the couch. And as I have not yet built a nas/mediaserver (next project) I currently run this 24/7 so those components would add quite a bit to my tdp and increase the cost of running it.