Water pump suggestions?

Looking to eventually expand my loop to accomodate my GPU (when i upgrade it later this year) so was looking to get a pump soonish, either to go with my current pump and just use one overall loop or have 2 loops running at once, with this in mind what would you recommend for a pump? Ideally as cheap as possible and quietness is the key factor here, I know the d5's are like £70+ which is out of my price range at the moment so really looking for a reliable alternative?


Any suggestions are appreciated :D.