Originally started life as an Alienware X51 I bought when I first got into PC gaming back in early 2013. At the time I knew nothing about PC hardware, and it turned out the £800 Alienware came with a GeForce GT 640. About a year later I upgraded the card to a GTX 660 but ran into power issues as 330w was the maximum PSU that the X51 could be fitted with.
I then decided I wanted to build my own system so I could use a larger power supply, so I bought an EVGA Hadron Air chassis and reused the motherboard, CPU and 1TB HDD, and buying an SSD, 16GB of RAM, new CPU cooler and additional 2TB HDD. I chose to go for purple LED's as I wanted a color that isn't used as much as red/blue to make it a bit different. In June 2015 I upgraded the GTX 660 to a GTX 970.
Cable management in the Hadron can be a pain as there's no space at the back to route cables, but the custom 500w PSU that comes with it has cables with appropriate lengths which helps a lot. I personally think it's one of the best looking mini-ITX cases out there, however it does attract quite a lot of dust as there aren't any dust filters on the top or bottom.