Another, slightly more costly, but much faster and better for future upgrades option 
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor with FREE Operation Flashpoint Red River Game £161.99
(£134.99) £161.99
(£134.99)
Gigabyte H67M-UD2H-B3 Intel H67 (Socket 1155) DDR3 Motherboard - (Sandybridge) ** B3 REVISION ** £79.98
(£66.65) £79.98
(£66.65)
Microsoft Windows 7 Bundle - Home Premium 64 Bit £68.40
(£57.00) £68.40
(£57.00)
Options applied to the above product:
Western Digital Caviar Blue 500GB SATA 6Gb/s 16MB Cache - OEM (WD5000AAKX) £29.99
(£24.99) £29.99
(£24.99)
Coolermaster Elite 430 Windowed Case - Black (with 500w Elite Power PSU) £64.99
(£54.16) £64.99
(£54.16)
Kingston HyperX Blu 4GB (2x2GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit (KHX1333C9D3B1K2/4G) £35.99
(£29.99) £35.99
(£29.99)
Sony Optiarc AD-5260S 24x DVD±RW SATA ReWriter (Black) - OEM £15.98
(£13.32) £15.98
(£13.32)
Sub Total : £381.10
Shipping cost based on delivery to Home Address with:
FREE SHIPPING (DPD Next Day)
(This can be changed during checkout) Shipping : FREE
VAT is being charged at 20.00% VAT : £76.22
Total : £457.32
Could be wrong, but iirc the Intel HD3000 is better than the AMD HD4250 (sure Stulid will tell me if I'm remembering wrong
)
EDIT: Not only massive overkill, but probs better than your PC!

Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor with FREE Operation Flashpoint Red River Game £161.99
(£134.99) £161.99
(£134.99)
Gigabyte H67M-UD2H-B3 Intel H67 (Socket 1155) DDR3 Motherboard - (Sandybridge) ** B3 REVISION ** £79.98
(£66.65) £79.98
(£66.65)
Microsoft Windows 7 Bundle - Home Premium 64 Bit £68.40
(£57.00) £68.40
(£57.00)
Options applied to the above product:
Western Digital Caviar Blue 500GB SATA 6Gb/s 16MB Cache - OEM (WD5000AAKX) £29.99
(£24.99) £29.99
(£24.99)
Coolermaster Elite 430 Windowed Case - Black (with 500w Elite Power PSU) £64.99
(£54.16) £64.99
(£54.16)
Kingston HyperX Blu 4GB (2x2GB) DDR3 PC3-10666C9 1333MHz Dual Channel Kit (KHX1333C9D3B1K2/4G) £35.99
(£29.99) £35.99
(£29.99)
Sony Optiarc AD-5260S 24x DVD±RW SATA ReWriter (Black) - OEM £15.98
(£13.32) £15.98
(£13.32)
Sub Total : £381.10
Shipping cost based on delivery to Home Address with:
FREE SHIPPING (DPD Next Day)
(This can be changed during checkout) Shipping : FREE
VAT is being charged at 20.00% VAT : £76.22
Total : £457.32
Could be wrong, but iirc the Intel HD3000 is better than the AMD HD4250 (sure Stulid will tell me if I'm remembering wrong

EDIT: Not only massive overkill, but probs better than your PC!
