This build has been complete for a couple of weeks and has so far been fine. I had some troubles with Windows 8.1 causing random crashes and stuff... Well in the end I've installed Windows 7 64-bit, and it flies with rock solid stability. I expect there are some Windows 8.1 driver issues? I originally had the stock AMD cooler fitted to the FX, but quickly junked it for the Hyper 212 EVO and now the system is much quieter and cooler. Sorry about the rather lousy pictures - in my haste to initially build the thing I never took any, so I took these after the Hyper 212 was fitted. The only carry over parts from my last computer (which was actually a laptop) are a Seagate Momentus thin 500GB 2.5" HDD for storage/games and a pound shop Bluetooth USB adapter. I also bought a Logitech wireless keyboard and mouse from PC World (£20) and using a Philips 19" monitor for general use, but I connect to my Panasonic 1080HD TV for gaming. For around £500 I couldn't be happier with this system!
Edit Jan 2015. One year on and the system has changed, but not much. One of the fans has gone, I found the side case fan quite pointless - it added noise and dust, and did nothing for temps so while it is still in place it's disconnected. The original 64GB Sandisk SSD has been replaced with a 120GB OCZ Arc100 SSD, which is faster and bigger and... better. The original Seagate 2.5" HDD was replaced ages ago with a WD Black 1TB as that old laptop drive was full and slow, the WD is a screamer. The Philips 19" monitor has been upgraded to a 22" BenQ LED 1080p with HDMI input which is so much nicer. Windows 8.1 is now the OS of choice. Originally this system and Win 8.1 did not get along, but through persistence (possibly with Win8 "maturing" I dunno?) it is 100% stable and very fast. And finally the FX6300 has been overclocked to a stable 4Ghz and all in all I'm still very happy with the system. The R9 270 has also had a little overclock to 1100Mhz, every little helps!