My current setup.
Mac Pro 2,1
2 x 3GHz Quad-Core Xeon
32GB RAM
ATI Radeon HD 5770
2x Dell S2415H LCDs
I bought the Mac Pro from Craigslist for $150 and brought it back to life. Since its an old system, parts was super cheap. All together (including the Mac) i spent $100 to get it up and running again.
My previous setup
Intel Core i5-6500 3.2Ghz (Skylake)
Noctua NH-L9i CPU Cooler
Gigabyte GA-H170N-WIFI LGA1151
Crucial Ballistic Sport LT 16GB (2 x 8GB)
Samsung 256GB SSD
Windows 10 Pro
Streacom - F1CWS Evo HTPC case
120w Power Supply (PicoPSU compatible)
picoPSU-160-XT 160W Power Converter Module
I wanted to build a minimal themed Windows box so this is what i came up with. The case looks like a taller Mac Mini and its 100% aluminum throughout. Its super clean and super quiet, and also for sale.