Current desktop running a mishmash of old gear, and my brand spanking new GTX 1070 (replaced R9 280). Almost cheaped out and got the RX 480, but I'm glad I didn't as I just upgraded to a Seiki Pro 32" 4k monitor.
Love building in the Corsair 250D, and all of the space is well utilized. Cable management is a bit of a mess though. Found a brushed aluminum faceplate and added a slot-load bluray drive. H100i backplate was loose on my motherboard so needed to add some size 6 washers.
Mostly use this for occasional gaming, and ripping DVDs/BRs to my Plex server NAS. No modifications, no overclocking yet. Nothing crazy, just running stock.