This is my third official build on PC Part Picker. And I wanted to do something dramatically different this time around. Building and upgrading two different PCs has left me with a lot of spare parts over the years. And a motherboard disaster last year left me with a nice i5-3570K sitting in a box being unused and collecting dust. So I decided that I was going to build this rig as cheaply as possible - buying only the case, power supply, and motherboard. I did splurge and buy a new graphics card when I saw that Newegg had the $260 card on sale for $189. The goal was to build a compact, Playstation sized system that can be used just about anywhere. Everything else is used. So here is the rationale behind the parts I chose.
CPU: Intel Core i5-3570K
There was a time before Skylake and Haswell where this CPU was king of the castle. And it still is in a lot of circles. I scored a deal on it at the time thanks to an Amazon gift card. I also had an i5-3450 that I eventually sold on eBay, the money I made from that sale went to this rig.
Motherboard: Zotac Z77-mITX WIFI
Of course in 2015 Ivy Bridge is now a distant memory. But that doesn't change the fact that I needed a motherboard to make this build work. This was the effort of tons of hours of eBay searches, discount and aftermarket store searches, Reddit Hardware Swap, consultations on Tom's Hardware, and just about everywhere else you can think of. I finally saw this on eBay and didn't hesitate one minute to pull the trigger. It definitely paid off as this is one of the best motherboards that I have ever used. And it is such a unique part that it doesn't even have a page on PC Part Picker! A very solid motherboard. The UEFI BIOS is great and competes with the best of them from Gigabyte, Asus, and so on.
RAM and storage: The hard drive and SSD were both left over from my previous laptop and desktop builds. On a Silverstone Raven you're limited to 2.5" drives although some cases do let you use 3.5" drives. The optical I'm still deciding on, whether or not I decide to use it at all. I will at least get a cheap one when I get the chance. I will be upgrading the RAM to 16GB of Corsair Vengeance LP DDR3-2400 when I get the chance as well.
Case and PSU: These two things are the only new things besides the motherboard that I purchased. The Silverstone SX is really your only option for a quality PSU for ITX so that is a no brainer. For a small PSU, this is definitely a quality unit and ranks up there with the best of them. I finally decided on getting the Silverstone RVZ01B, which is pretty awesome. Better than I had expected and very easy to build in given the small form factor.