OK I just ordered the following...

1 x MBB-M2N42 Motherboard Bundle - AMD X2 4200 AM2, Heatsink and Fan, 1024MB DDR2 533 RAM, Asus AM2 Motherboard

1 x NOV-76GT Novatech GeForce 7600GT PCI-E 256MB DDR3 DVI/TVO SLI

All for £380.00. I hope it all works flawlessly or the wife will have my head on a plate.

Thanks to everyone who gave me guidance.