Please check my spec! :)

Hey all, I've been trying to design a laptop suitable for moderate gaming (to play Dayz and ArmA III etc) on PC Specialist and have come up with something that meets my budget. So I was wondering if you could give me any improvements/ recommendations.

Chassis & Display Cosmos Series: 15.6" Matte Full HD IPS LED Widescreen (1920x1080)
Processor (CPU) Intel® Core™i7 Quad Core Mobile Processor i7-4710MQ (2.50GHz) 6MB
Memory (RAM) 8GB KINGSTON HYPER-X GENESIS 1600MHz SODIMM DDR3 (1 x 8GB)
Graphics Card NVIDIA® GeForce® GTX 850M - 2.0GB DDR3 Video RAM - DirectX® 11
2nd Graphics Card NONE
Memory - Hard Disk 1TB WD SCORPIO BLUE WD10JPVX, SATA 6 Gb/s, 8MB CACHE (5400 rpm)
2nd Hard Disk NONE
mSATA SSD Drive NONE
DVD/BLU-RAY Drive 8x SATA DVD±R/RW/Dual Layer (+ 24x CD-RW)
Memory Card Reader Internal 9 in 1 Card Reader (MMC/RSMMC/SD: Mini, XC & HC/MS: Pro & Duo)
Thermal Paste ARCTIC MX-4 EXTREME THERMAL CONDUCTIVITY COMPOUND
Sound Card Intel 2 Channel High Definition Audio + MIC/Headphone Jack
Bluetooth & Wireless GIGABIT LAN & WIRELESS INTEL® ULTIMATE N-6300 (450Mbps)
Wireless Router/HomePlugs NONE
USB Options 3 x USB 3.0 PORTS + 1 x USB 2.0 PORT AS STANDARD
Battery Cosmos Series 6 Cell Lithium Ion Battery (48.84WH)
Power Lead & Adaptor 1 x UK Power Lead & 120W AC Adaptor
Operating System Genuine Windows 8.1 64 Bit - inc DVD & Licence
DVD Recovery Media Windows 8.1 (64-bit) DVD with paper sleeve
 
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