CPU- I chose this CPU because I have heard some very good reviews of it, I couldn't afford an intel core i5 and it's an extremely good budget CPU.
Motherboard- I picked this motherboard because I like the asrock bios, it was cheapish (I paid £60, then the price went down just after it got dispatched -.-), it has a usb 3 header (although it's put in a stupid place), it has crossfire capabilities, and it had everything I needed on it :).
Graphics card- Originally I was going to get an HD7870 but when I was looking around on scan I found this for £15 more and it has a better cooler (I think) and it came with a free copy of battlefield 4! I have overclocked it to the max it can go (1100mhz) and under full load the gpu is always under 65 degrees and the fan speed is only 49%. Overall I really like this card and would recommend it.
HDD- My friend had already bought this for his build and he liked it and recommended it to me.
RAM- Alot of people use this RAM and like it, and so do I. I decided to get the low profile edition as it would give me more of a range of CPU coolers to pick from.
Case- I love this case, it looks good, alot of room for cable management, has a built in fan controller that can control up to 7 fans, and it has a window. But I couldn't install my hard drive into the modular bays as they are not wide enough so I can only use the bottom two to install 3.5 inch hard drives :(.
PSU-I bought this off my mate for £40 and it is only 3 months old, it was powering a gtx650ti boost and an i5 4430 so it wasn't being strained at all and it is in perfect condition.
I have just ordered two cooler master sickleflow red LED fans to put in the top (i'm gonna try and dis-able the blue LED's in the fan so I can still use it.) I think red LED's will suit an AMD build :P, i am going to upgrade the cpu cooler when I next get a good amount of money (any recommendations would be appreciated!) I might get a dark rock pro2 cooler. My uncle gave me windows 7 professional 64 bit for free :). Overall i'm glad with this build it runs BF4 at 720p, ultra settings, average 65fps and my old laptop has 1gb RAM and an intel celeron single core 2.2ghz so I desperately needed to upgrade. Overall it cost me about £540/$879.77.