http://pcpartpicker.com/p/P7gZXL - will this build run Skyrim with ultra settings and lots of mods? Is their a cheaper alternative that will do a better/the same job? My budget is about £800-£900 thereabouts. All help is appreciated!
whilst it's not identical to yours, it's a great guide to show you the basics. https://www.youtube.com/watch?v=Uk45njIUvH0&index=3&list=PL8mG-RkN2uTwlcLU_rv29Gt4578XfgJm_
so to the build. I'd stick with the first one personally. 16GB RAM and an i7 is overkill for Skyrim, no need to spend that much
switch to an XFX power supply as well if you want - there's actually nothing BAD about Corsair CX power supplies, but the XFX will likely be better. the only thing you should definitely do is switch to either a semi-modular or fully modular PSU, this means you can pick and choose the cables you need and it'll be a godsend when you get around to building the system. Corsair do a 'CXM' series, but you can narrow down to modular via PC Part Picker to look for other versions. Maybe take a look at the Corsair RM series - silence optimised, will go great with the Define R4 (great choice BTW, I recently bought one myself), and a lot more efficient, plus it's fully modular
I'd personally swap the RAM to this: http://uk.pcpartpicker.com/part/corsair-memory-cmz8gx3m2a1866c9 solely becuase you 'll be looking at blue RAM on a red motherboard through to side panel window - would drive me nuts 😛 up to you though
also, slightly better motherboad for overclocking: http://uk.pcpartpicker.com/part/msi-motherboard-z97gaming3 (I think, given the addition of extra heat syncs, hard to tell in reality though), and also slightly cheaper than most of the ASROCK listings I could see - correct me if I'm wrong and the asrock was cheaper. And a better GPU - a bit cheaper I believe, as well: http://uk.pcpartpicker.com/part/msi-video-card-912v308002 plus, the styling matched to motherboard... Yeah i'm OCD about that type of thing 😛 my only other suggestion would be perhaps get a SSD - will help with faster boot ups and loading all those mods 


http://uk.pcpartpicker.com/part/fractal-design-case-fdcadefr4bl


http://uk.pcpartpicker.com/part/intel-cpu-bx80646i54690