I'd probably go with this, the DS3 is noted for better overclocking with the 6300 & 6400 chips than the DS4(which is better for 6600 and above), the Geil is good Ram and compatible with pretty much any motherboard that uses DDR2.
MB-061-GI Gigabyte GA_965P_DS3 (Socket 775) PCI-Express DDR2 Motherboard (MB-061-GI)
£91.99 £91.99
MY-058-GL GeIL 2GB (2x1GB) PC6400 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC) (MY-058-GL)
£169.99 £169.99
Subtotal £261.98
Shipping (City Link Parcel Next Day (Delivered Mon-Fri)) £8.25
VAT £47.30
Total £317.53