I've got a
Sharkoon 1000 Golfy on my Scythe Infinity, and it keeps temps down while being inaudible from a few feet away.
The Scythe Flex series (
800rpm,
1200rpm and
1600rpm) are highly thought of too. The Noctua fans, while being excellent performers, apparently have some quality issues. I can't vouch for that myself, but I've read a few reports of them failing.
Big heatsink + slow fan = best compromise for me. If you want sheer performance without noise being much of a consideration, then I'm not the guy to ask.