Looking for a custom built PC with a budget of £1600

Hi i wondering if anyone could help me out, I do a lot 3D, animation and video editing, plus i like game now and again. I was thinking to get a pretty powerful Origin PC, but i have decided on getting a custom built PC with a budget of £1600 i don't really want to go to far off this mark.

I want it to be future proof and upgradable to upto 3 years, this is a spec i got from https://www.pcspecialist.co.uk/computers/intel-2011-extreme/

Case - STYLISH PIANO BLACK ENIGMA CASE + 2 FRONT USB
Processor (CPU) - Intel® Core™i7 Six Core Processor i7-4930K (3.4GHz) 12MB Cache
Motherboard - ASUS® P9X79 LE: INTEL® SOCKET LG2011
Memory (RAM) - 16GB KINGSTON HYPER-X GENESIS DUAL-DDR3 1600MHz, X.M.P (2 x 8GB KIT)
Graphics Card - 3GB NVIDIA GEFORCE GTX 780 Ti - 2 DVI, HDMI, DP - 3D Vision Ready
Memory - 1st Hard Disk-120GB KINGSTON V300 SSD, SATA 6 Gb (450MB/R, 450MB/W)
2nd Hard Disk - 1TB 3.5" SATA-III 6GB/s HDD 7200RPM 32MB CACHE
DVD Drive - 24x DUAL LAYER DVD WRITER ±R/±RW/RAM
Memory Card Reader - INTERNAL 52 IN 1 CARD READER (XD, MS, CF, SD, etc) + 1 x USB 2.0 PORT
Power Supply - CORSAIR 650W CS SERIES™ MODULAR 80 PLUS® GOLD, ULTRA QUIET
Processor Cooling - INTEL SOCKET LGA2011 STANDARD CPU COOLER
Thermal Paste - ARCTIC MX-4 EXTREME THERMAL CONDUCTIVITY COMPOUND
Sound Card - ONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO (AS STANDARD)
Wireless/Wired Networking - 10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options - MIN. 2 x USB 3.0 & 6 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS
Power Cable - 1 x 2 Metre UK Power Cable (Kettle Lead)
Operating System - Genuine Windows 8.1 Professional 64 Bit - inc DVD & Licence

Quote Value: £1,684.00

Could i get a better custom built PC, for around that price or less?

I done a similar spec PCPartPicker part list if this helps

CPU: Intel Core i7-4930K 3.4GHz 6-Core Processor (£413.18 @ Ebuyer)
CPU Cooler: Arctic Cooling UCACO-FI30201-GB 74.0 CFM Ball Bearing CPU Cooler (£31.56 @ Scan.co.uk)
Thermal Compound: Arctic Cooling MX4 20g Thermal Paste
Motherboard: Asus P9X79 LE ATX LGA2011 Motherboard (£160.07 @ Dabs)
Memory: Kingston HyperX 16GB (2 x 8GB) DDR3-1600 Memory (£121.37 @ CCL Computers)
Storage: Samsung 840 EVO 250GB 2.5" Solid State Disk (£99.99 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£42.99 @ Amazon UK)
Video Card: Gigabyte GeForce GTX 780 Ti 3GB Video Card (£557.74 @ Scan.co.uk)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case (£89.99 @ Novatech)
Power Supply: Corsair RM 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£83.93 @ Aria PC)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
Operating System: Microsoft Windows 8.1 Pro - 64-bit (OEM) (64-bit)
Total: £1600.82

It should be a good machine. I use a similar setup for my render slaves(4930k/P9X79-WS) and I'm very happy about render performance.