Originally Posted by
Kagthul
An idea to think about is getting a used Mac Mini. You dont need to run OSX on it - you can install Windows or Linux of your choice extremely easily.
If you look for a used "2011" or "2012" model "server" Mini they come with full-up Quad-core i7s in them. You can usually find them for 350-500$ on craigslist. (i have purchased... six or seven in the last year or so for clients, they are extremely popular with DJs) They have HDMI out, SPDIF out, Thunderbolt, loads of USB ports, and they are tiny (the size of a few stacked CD jewel cases). They support up to 16GB of DDR3 (1333 in the "2011" model and 1600 in the "2012" models).
Only issue is that they dont have great internal storage (the "server" models will fit 2 2.5" drives), but that is easily solved with an external HDD enclose or a NAS.
I use a slightly older Mini (the last one that had a DVD drive in it - 2.4Ghz Core 2 Duo) for my media center and it is a champ.
I use it with the Apple Bluetooth Keyboard and Bluetooth Trackpad (there's a company that sells a frame to join them into one unit) and its pretty great.