Hi. I've just found a different post http://www.tomshardware.co.uk/forum/278623-10-phenom-stock-overclock
that recommends the Hyper 212 Plus.
Here in Spain it would cost me 26€; I think I'll go for it, thanks.
Edit: In the webstore where I usually buy the Hyper 212 isn't available. Would you recommend anything else? Thanks again.