This is the best rig you are going to get for around £700. It should play the new Assassins Creed ok, how well it play it will depend on the games requirements. If you want to knock it below £700 just drop the case to the CM Elite.
Case
PCS MAELSTROM T900 BLACK GAMING CASE
Processor (CPU)
AMD PHENOM II X4 QUAD CORE 955 (3.20GHz/8MB CACHE/AM3)
Motherboard
ASUS® M5A87: AM3+ PLATFORM, DUAL DDR3,SATA 6.0GB/s, USB 3.0
Memory (RAM)
4GB SAMSUNG DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card
1GB NVIDIA GEFORCE GTX 560 Ti - 2 DVI,HDMI,VGA - 3D Vision Ready
Memory - 1st Hard Disk
500GB SEAGATE Barracuda SATA-III 6Gb/s HDD, 32MB Cache (7200rpm)
1st DVD/BLU-RAY Drive
24x DUAL LAYER DVD WRITER ±R/±RW/RAM
Power Supply
CORSAIR 650W ENTHUSIAST SERIES™ TX650 V2-80 PLUS® BRONZE (£72)
Processor Cooling
STANDARD AMD CPU COOLER
Sound Card
ONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities
ONBOARD 10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options
6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD
Operating System
Genuine Windows 7 Home Premium 64 Bit - inc DVD & Licence (£79)
Office Software
NO OFFICE SOFTWARE
Anti-Virus
NO ANTI-VIRUS SOFTWARE
Warranty
3 Year Silver Warranty (1 Year Collect & Return, 1 Year Parts, 3 Year Labour) (£5)
Delivery
STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build Time
Standard Build - Approximately 10 to 12 working days
Quantity
1
Slightly over bugdet. If you want to get it below £700 you can change the case to cooler master elite 310, or the graphics card to either amd6870 or gtx560
Case
COOLERMASTER HAF 912 PLUS MID TOWER GAMING CASE
Processor (CPU)
AMD PHENOM II X4 QUAD CORE 955 (3.20GHz/8MB CACHE/AM3)
Motherboard
ASUS® M5A87: AM3+ PLATFORM, DUAL DDR3,SATA 6.0GB/s, USB 3.0
Memory (RAM)
4GB SAMSUNG DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card
1GB NVIDIA GEFORCE GTX 560 Ti - 2 DVI,HDMI,VGA - 3D Vision Ready
Memory - 1st Hard Disk
1TB SATA-II 3-Gb/s HARD DRIVE WITH 32MB CACHE (7,200rpm)
1st DVD/BLU-RAY Drive
24x DUAL LAYER DVD WRITER ±R/±RW/RAM
Power Supply
CORSAIR 650W ENTHUSIAST SERIES™ TX650 V2-80 PLUS® BRONZE (£72)
Processor Cooling
STANDARD AMD CPU COOLER
Sound Card
ONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities
ONBOARD 10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options
6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD
Operating System
Genuine Windows 7 Home Premium 64 Bit - inc DVD & Licence (£79)
Office Software
FREE Microsoft® Office Starter 2010 (Limited functionality Word & Excel)
Anti-Virus
BULLGUARD INTERNET SECURITY - FREE 90 DAY TRIAL
Warranty
3 Year Silver Warranty (1 Year Collect & Return, 1 Year Parts, 3 Year Labour) (£5)
Delivery
STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)
Build Time
Standard Build - Approximately 10 to 12 working days
Quantity
1