Unfortunately Killernoodle, I don't think the Danner Mag pumps are available in Belgium, as they have that weird 220V 50Hz stuff in the wall instead of nice normal 110V 60Hz.
I could be wrong though. I know that Europe does have Eheim pumps, which are about the same quality, or maybe a bit better than the Danners.
I would add that Krazy's response was very good, except that I would probably put a bit more emphasis on head pressure than on flow rates. I would almost say to get the highest head pressure you can afford, and don't even worry about the flow rate since any good head pressure pump will have acceptable flow.
Gooserider