If you need help with every part, that translates to "I lack sufficient knowledge, so I'd like assistance".
If so, why have you already picked a 780? It might not be the best option. I'll assume you don't want to
OC, yes?
I'll start the thread off with:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: AMD FX-8350 4.0GHz 8-Core Processor (£143.99 @ Aria PC)
Motherboard: ASRock 970 EXTREME4 ATX AM3+ Motherboard (£74.97 @ Amazon UK)
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-1600 Memory (£78.47 @ Amazon UK)
Storage: Samsung 840 Series 250GB 2.5" Solid State Disk (£145.00 @ Ebuyer)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive (£64.80 @ Amazon UK)
Video Card: MSI GeForce GTX 780 3GB Video Card (£599.00 @ Scan.co.uk)
Case: Cooler Master HAF X ATX Full Tower Case (£130.19 @ CCL Computers)
Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£67.97 @ Dabs)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£12.94 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£68.39 @ Aria PC)
Total: £1385.72
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-12 13:09 BST+0100)
Solid contender too. A GTX 690 is way expensive.
You could make this build cheaper, but I'll wait for some replies. A GTX Titan is also out of the
question. This build can go SLI too. However if you add a 690 then:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: AMD FX-8350 4.0GHz 8-Core Processor (£143.99 @ Aria PC)
Motherboard: ASRock 970 EXTREME4 ATX AM3+ Motherboard (£74.97 @ Amazon UK)
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-1600 Memory (£78.47 @ Amazon UK)
Storage: Samsung 840 Series 250GB 2.5" Solid State Disk (£145.00 @ Ebuyer)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive (£64.80 @ Amazon UK)
Video Card: Asus GeForce GTX 690 4GB Video Card (£798.99 @ Amazon UK)
Case: Cooler Master HAF X ATX Full Tower Case (£130.19 @ CCL Computers)
Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£67.97 @ Dabs)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£12.94 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£68.39 @ Aria PC)
Total: £1585.71
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-12 13:13 BST+0100)
Which is still within your budget. It's just so expensive by far most people avoid it.
It's a very good GPU though. Two GPUs in one. But it can be argued that cheaper GPUs
in pairs will do better. This build is just pretty extreme:
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: AMD FX-8350 4.0GHz 8-Core Processor (£143.99 @ Aria PC)
Motherboard: ASRock 970 EXTREME4 ATX AM3+ Motherboard (£74.97 @ Amazon UK)
Memory: Corsair Dominator Platinum 32GB (4 x 8GB) DDR3-1866 Memory (£290.00 @ Ebuyer)
Storage: Samsung 840 Series 250GB 2.5" Solid State Disk (£145.00 @ Ebuyer)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive (£64.80 @ Amazon UK)
Video Card: Asus GeForce GTX 690 4GB Video Card (£798.99 @ Amazon UK)
Case: Cooler Master HAF X ATX Full Tower Case (£130.19 @ CCL Computers)
Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£67.97 @ Dabs)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£12.78 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£68.39 @ Aria PC)
Total: £1797.08
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-12 13:15 BST+0100)
That's utter luxury really. Needless to say it would run two monitors easily; depending on the resolution.
You're also correct in that cooling is important. Hence the case is a HAF case. High Air Flow.
Which games do you intend on playing? And what's your resolution?