Most cl9 ddr3 240 pin non-ecc ram will work fine. I use gskill ripjaws 1333 on my asus H61 board. Corsair, crucial, samsung, patriot, and kingston should all work even if you don't see them on the approved list.
where do you recommend i buy the ram from?? im in the uk
I don't know where the best deals are in the UK, but perhaps someone from there will reply. I don't use ebay because of the higher fees including paypal.