6 watt pump for 90 euros? No thanks. Its also huge. I was using an Eheim 1048 (next model up from this one -

) back in 1998(ish??) to watercool a p3 600 @ 900.
If you want quiet get an EK DCP 2.2 as for 35 euros as its just as good as anything else in the 5 to 10 watt range and smaller than most too. If you want power get an EK DCP 4.0 / DDC Ultra / D5 (in order of price). They're roughly equal performance - imo the price difference between them isnt worth the difference. Get whichever you can find for cheapest.
EK DCP pumps are also sold as OCZ Hydro series and DangerDen CPX series (DD got there first though supply in europe is low and always has been, ocz and ek have just started selling these but are shipping in volume).