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$30 - IO Crest SATA III 4 Port PCI-e 2.0 x1 Card with Low ProfileBracket (SI-PEX40064) - motherboard only has 2 onboard sata ports
$50 - AMD Athlon 5350 APU, 2.05Ghz, AD5350JAHMBOX
$85 - HyperX 8GB Kit (2x4GB) 1600MHz DDR3 PC3-12800
$35 - GIGABYTE GA-AM1M-S2H AM1 HDMI SATA 6Gb/s USB 3.0 Micro ATX AMD Motherboard
$60 - Antec EarthWatts EA-380D Green 380 Watt 80 PLUS BRONZE Power Supply
$125 - 120G SSD Samsung 840
$250 - 2x 3T WD Red
$80 - Silverstone Tek SG02B-F-USB3.0 ABS/SECC Steel MicroATX Desktop Computer Case
Ubuntu 14.04 server. ZFS for storage.
Its not the fastest rig, but quad core, plenty of RAM for a minecraft server, owncloud, gitlab, and plex. Still working on mythtv setup, but might scrap that soon.
With the all 3 drives spun up and server idle, it pulls 39W. With 2 3T drives spun down, its only 19W. I'm very happy with this as my home server.