Budget - £600, 730 euro, $1000 (£100 for OS/case, not mentioning here)
CPU - Intel Core i5-3470 3.2GHz Quad-Core Processor - £135.98 Aria PC
CPU cooler - Arctic Cooling Freezer 7 Pro Rev.2 45.0 CFM Fluid Dynamic Bearing CPU Cooler - £16.25 Ebuyer
Motherboard - ASRock H77M Micro ATX LGA1155 Motherboard - £52.35 Amazon
Memory - Corsair XMS3 8GB (1 x 8GB) DDR3-1333 Memory - £49.67 Amazon
SSD - Samsung 840 Series 120GB 2.5" Solid State Disk - £79.86 CCL computers
Graphics - Gigabyte GeForce GTX 750 1GB Video Card - £89.70 scan.co.uk
PSU - Zalman 550W 80+ Gold Certified Semi-Modular ATX Power Supply - £48.57 Amazon
I would go as far as to say I'm not an idiot when it comes to this stuff but I'm by no means an expert, and I didn't spend a really long time on this, but for my low-mid range budget I think this should do well, wanted to get some second opinions though. The machine is primarily for WoW (will be frapsing, maybe streaming) but other games I will probably play are LoL, DoTA and possibly FPS games like CS.
Any advice or opinions are wanted - thanks.