I built this computer because I wanted to experience the joy of PC-Gaming after years of using my ol' Xbox 360. Prior to building this gaming pc, I had a fairly new Macbook Pro 15" and an old Xbox 360. I sold the console and the laptop for money to buy components for my gaming pc. I rarely ever used the OS X operating system; I dual-booted it with windows. The fact that I didn't use OS-X made my realize that I wasted money purchasing that terrible mac, so I sold it to buy the components for my gaming rig. I use this PC for: gaming, listening to music, computer programming, web-design, studying, anime and hentai (:D).
CPU: At first, I was a little skeptical about the price of the processor compared to something like an FX-6300 which costs around £90. However, I decided that I would rather have a fewer amount of stronger cores than more weaker cores. Also, I don't really want to go out of my way to change the platform of this build in two years to another platform due to having a weak cpu. If I want more power from my 4670k, I have a little more headroom for over clocking if I increase the voltage.
CPU Cooler: I wanted a CPU-cooler with a smaller heatsink due to the clearance between the cpu socket and the first PCI-express lane. Many of you may be thinking that a water-cooler would have solved the problem, but in the past, I've had several problems with water-coolers such as the h100. I used a h100 in my previous build and I had to replace it since the pump stopped functioning. It's also pretty quite for a cpu-cooler that uses a 92mm fan; I guess that's down to noctua's engineering.
Motherboard: This motherboard has all the features that I will ever need; to be honest, I'll probably never use most of them. I could have saved some money by buying a cheaper motherboard, but I decided to pay extra for one that looks pretty cool with a black PCB and red heatsinks.
SSD: Bought this on sale a few months ago, it really makes a difference, in terms of read/write speeds compared to my old 5400rpm HDD that I had upon building this rig.
GPU: Although I don't game much, I want my GPU to last me atleast two years. Considering the amount of performance the GTX 770 offers, I think I will be covered until then. It also looks pretty cool with the MSI twinfrozer heatsink and the blue leds (in contrast with the red fan leds).
PSU: Note, the psu in the parts list is corsair's equivalent to the psu shown in my build. The PSU shown in my build is HX650. The reason why it is different to the one in my parts list is because I could not find the HX650 in the parts database when I was submitting this build. The reason why I chose the HX650 is because I will have 200w's of headroom for upgrading parts (e.g. adding more hard-drives of changing the gpu down the line). It is also pretty good since it's semi-modular which made cable management much easier since I didn't have to worry about hiding tentacles in my pc.