In general, any fans that have a high Static Pressure.
On the manufacturer's stats page, this is usually measured in mm/H20. A reasonable average for a home system is 2.5-3.5, but some of the more industrial ones go as high as 10!
However, a lot depends on a combination of the airflow spread of the fan and the fin density of the rad.
If the rad's fins are widely spaced, you're OK but with narrowly spaced fins, you'll want a fan that has a narrow airflow. If the fan blows air in a wide spread, it will buffet around between the fans too much... and if wide enough can cause compression, stalling the airflow and resulting in more noise and less cooling. You can theoretically damage the fan too, though it's not as likely these days.
EK Vardar F4 120-ER fans, for example, are very noisy on high FPI (fins per inch) rads like the XSPCs and they don't cool so well... but they are very good on medium and low FPI rads, like EK's own and Hardware Labs' Black ICE rads.
Unfortunately, I don't know of anywhere to check and compare what kinds of spreads each fan has, so it's a bit of trial and error.
Personally, I use Noctuas as a good reduction in noise for a small reduction in performance, but would happily go for Vardars, Noiseblockers, possibly Corsair MLs. Gentle Typhoons are still king IMO though... just harder to get hold of.
just a shame the £ has fallen so much 
