Sapphire ATI Radeon HD 3450 Silence 512MB DDR2 TV-Out/DVI/HDMI (PCI-Express) - Retail £30.54 x2
Gigabyte GA-P31-DS3L Intel P31 (Socket 775) PCI-Express DDR2 Motherboard - £46.99
Gonna need more than that Gigabyte board, it lacks a second PCI-E slot cos it's based on the P31 chipset.
As far as I can see, this is the cheapest Intel dual graphics mobo:
http://www.overclockers.co.uk/showp...P35 (Socket 775) PCI-Express DDR2 Motherboard