Buying a new PC

I am lhoping for comments and advice about the following setup that I am thinking of buying.
Any major errors in choices or minor tweaks to make it better?

Case
InWin CENTINAL BUC BLACK GAMING CASE
CPU
Overclocked Intel® Core™i5-3570k Quad Core (3.40GHz @ max 4.60GHz)
Motherboard
ASUS® P8Z77-V LX: USB 3.0, SATA 6GBs, ATI®CrossFireX
(RAM)
16GB KINGSTON HYPER-X GENESIS DUAL-DDR3 1600MHz, X.M.P (4 x 4GB KIT)
Graphics Card
3GB AMD RADEON™ HD7970 - DVI,HDMI,2 mDP - DX® 11, Eyefinity 4 Capable
1st Hard Disk
240GB INTEL® 335 SERIES SSD, SATA 6 Gb/s (upto 500MB/sR | 450MB/sW)
2nd Hard Disk
2TB 3.5" SATA-III 6GB/s HDD 7200RPM 64MB CACHE
DVD/BLU-RAY Drive
12x BLU-RAY RE-WRITER DRIVE, 16x DVD ±R/±RW
Memory Card Reader
INTERNAL 52 IN 1 CARD READER (XD, MS, CF, SD, etc) + 1 x USB 2.0 PORT
Power Supply
CORSAIR 850W ENTHUSIAST SERIES™ TX850 V2-80 PLUS® BRONZE
Processor Cooling
SPIRE GEMINI REV.3-THERMAX HDT TWIN FAN CPU
Sound Card
ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities
10/100/1000 GIGABIT LAN PORT - AS STANDARD Operating System
Genuine Windows 7 Home Premium 64 Bit w/SP1 - inc DVD & Licence

Price: £1,308.00 including VAT and delivery.