Thanks for all the feedback! I will do my best to respond to as many points as possible.
The case; I know it's a huge case but I've checked the measurements and I've got ideal space for it. I really picked that case because it had solid reviews and it's colour scheme will go well in my room.
SSD; I'll go with the Samsung.
The Corsair speakers seemed to get good user reviews from what I read, but I agree, the price is harsh. I will have a look about. Any other recommendations other than X-530's?
The keyboard; it's expensive but I have tried it at a mates and i really loved the feel to it. Makes typing fun.
PP, good spot with the fan. NXZT' are listed as 200mm but are apparently slightly smaller.
Motherboards;
MSI Z77A-GD55 - £129.95
MSI Z77A-GD55 Intel Z77 (Socket 1155) DDR3 Motherboard [Z77A-GD55]
Asus P8Z77-V LK - £93.97
Asus P8Z77-V LK Motherboard (Socket 1155, 32GB DDR3 Support, ATX, Intel Z77 Express, USB 3.0, CrossFireX & SLI Support, Display Port, Dual Intelligent Processors 3): Amazon.co.uk: Electronics
ASRock Z77 Extreme4 - £109.99
ASRock Z77 Extreme4 Intel Z77 (Socket 1155) DDR3 Motherboard [90-MXGKX0-A0UAYZ]
Just a few boards that I picked out. I take it they all have similar capabilities? Any advice on which one to go with, or another?
Where would I notice the difference with the 680? In general or mostly with gaming?
Thanks again for all your feedback.