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The Velocity pumps are dead silent but they will add a ton of heat to your tank, like 5F+ to a 40 gallon tank. Mag Drives are much louder than Eheims. You should look into the spankin new Tunze Silence pumps which are also designed to be very quiet. Check out the Reefbuilders post on the Tunze Silence pumps.From all the research I've done, the Velocity/Poseidon external pumps are dead-silent.
http://www.marinedepot.com/ps_AquariumPage~PageAlias~pumps_poseidon.html
Not sure if it is available in Europe?