This is my 2nd gaming build. I wanted to upgrade my previous build by quite a big margin, whilst keeping it at a similar price. Here's a breakdown:
CPU - Had to be AMD to get the best value for money. Didn't get the 8350 as an overclocked 8320 matches it - though I won't be doing this until I need to get a bit of a boost.
Motherboard - Great reviews for this board, and also looks quite nice as well. The various different ports are in great positions for cable management purposes.
Memory - I used XMS3 in my previous build and they worked great.
Storage - I had an SSD which I transferred from my previous build - 250Gb is plenty for me though I might RAID 0 a couple in the future. You can still purchase a 1TB+ HDD and keep this build under £600.
Video Card - This was great value at £160. It was an open box item, but hadn't been used by the previous customer.
Case - I love minimalistic cases and the 200R looks great. Also has decent cable management.
PSU - Though not the best PSU in the world, the CX range are great for people like me who aren't going to be maxing out their PC.
Optical - Cheap, works, cool.
OS - Windows 8 is being used more often where I work, and I'm in ICT Services, so I should probably learn how to use it before users start harassing me with their problems!
Peripherals were already taken care of, and I recommend each one - Sidewinder X4 keyboard, Roccat Lua mouse, Gamecom 780 7.1 headset and a 23" Acer monitor.
This build went very smoothly. I learnt from mistakes I made in the first build, and got this done in about an hour. Since my SSD was already setup, it didn't take long to start using it.