This is about the best you can get for your budget. It should be fine for your needs.
Case
COOLERMASTER ELITE 310 BLUE CASE
Processor (CPU)
AMD PHENOM II X2 DUAL CORE 565 (3.40GHz/6MB CACHE/AM3)
Motherboard
ASUS® M5A78L-M/USB3: M-ATX, USB 3.0, SATA 3.0Gb/s
Memory (RAM)
4GB SAMSUNG DDR3 DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card
1GB AMD RADEON™ HD6770 - DVI,HDMI,VGA - DX® 11
Memory - 1st Hard Disk
1TB SERIAL ATA 3-Gb/s HARD DRIVE WITH 16MB CACHE (7,200rpm)
1st DVD/BLU-RAY 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
450W Quiet 80 PLUS Dual Rail PSU + 120mm Case Fan (£29)
Processor Cooling
STANDARD AMD CPU COOLER
Sound Card
ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities
ONBOARD 10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options
4 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