[FOSDEM] Prepaid SIM card

Hi, I usually buy a prepaid SIM card when I am traveling abroad. Does anybody have recommendations which one to take? It would be great if I could buy it at the airport, but that is optional. I would mostly use the it for internet access. I would probably send a text message here and there. It would be nice to be able to call somebody local, but I almost never use that. Thanks, Željko