Intel no monitor and slightly over:
Gigabyte GA-73PVM-S2 NVIDIA GeForce 7100 / nForce 630i Chipset (Socket 775) PCI-Express DDR2 Motherboard £50.59
(£43.99) £50.59
(£43.99)
Intel Celeron E1400 2.0Ghz Dual-Core Processor (LGA775) - Retail Intel Celeron E1400 2.0Ghz Dual-Core Processor (LGA775) - Retail £34.01
(£29.57) £34.01
(£29.57)
Antec Basic 350W Power Supply Antec Basic 350W Power Supply £33.98
(£29.55) £33.98
(£29.55)
Western Digital Caviar Blue 160GB SATA-II 8MB Cache - OEM (WD1600AAJS) Western Digital Caviar Blue 160GB SATA-II 8MB Cache - OEM (WD1600AAJS) £29.99
(£26.08) £29.99
(£26.08)
Corsair 2GB (2x1GB) DDR2 Value Select PC2-4200C5 Dual Channel (VS2GBKIT533D2) Corsair 2GB (2x1GB) DDR2 Value Select PC2-4200C5 Dual Channel (VS2GBKIT533D2) £22.99
(£19.99) £22.99
(£19.99)
Asus TA-861 Midi-ATX Case - Black/Silver (No PSU) Asus TA-861 Midi-ATX Case - Black/Silver (No PSU) £21.99
(£19.12) £21.99
(£19.12)
LG GH22NP20 22x DVD±RW IDE Dual Layer ReWriter (Black) - OEM LG GH22NP20 22x DVD±RW IDE Dual Layer ReWriter (Black) - OEM £16.99
(£14.77) £16.99
(£14.77)
Sub Total : £183.07
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £11.75
VAT is being charged at 15% VAT : £29.22
Total : £224.04
And AMD no monitor slightly over:
AMD Athlon 64 X2 Dual Core 7750 2.70GHz (Socket AM2+) - Retail £49.99
(£43.47) £49.99
(£43.47)
Foxconn M61PMV nForce 430 (Socket AM2/AM2+) PCI-Express DDR2 Motherboard Foxconn M61PMV nForce 430 (Socket AM2/AM2+) PCI-Express DDR2 Motherboard £33.99
(£29.56) £33.99
(£29.56)
Antec Basic 350W Power Supply Antec Basic 350W Power Supply £33.98
(£29.55) £33.98
(£29.55)
Western Digital Caviar Blue 160GB SATA-II 8MB Cache - OEM (WD1600AAJS) Western Digital Caviar Blue 160GB SATA-II 8MB Cache - OEM (WD1600AAJS) £29.99
(£26.08) £29.99
(£26.08)
Corsair 2GB (2x1GB) DDR2 Value Select PC2-4200C5 Dual Channel (VS2GBKIT533D2) Corsair 2GB (2x1GB) DDR2 Value Select PC2-4200C5 Dual Channel (VS2GBKIT533D2) £22.99
(£19.99) £22.99
(£19.99)
Asus TA-861 Midi-ATX Case - Black/Silver (No PSU) Asus TA-861 Midi-ATX Case - Black/Silver (No PSU) £21.99
(£19.12) £21.99
(£19.12)
LG GH22NP20 22x DVD±RW IDE Dual Layer ReWriter (Black) - OEM LG GH22NP20 22x DVD±RW IDE Dual Layer ReWriter (Black) - OEM £16.99
(£14.77) £16.99
(£14.77)
Sub Total : £182.54
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £11.75
VAT is being charged at 15% VAT : £29.14
Total : £223.43
It is possible I built some for work for £160 (no monitor etc) but not from OC

unfortunately. They tend not to stock cheap low end parts.