International Baccalaureate in Barcelona - School

Hello everybody!
We are an expat family with teens Protected content 15) moving to Barcelona in the summer. I am now looking for an International School offering the IB diploma. I checked that there are a few in Barcelona, so this is a good thing. We dont mind if the school is British or American or International, as long as they offer the IB and English is the main language of instruction. We prioritize a good academic level, but sensible tuition fees, an afterschool sports programme and a friendly school community would be fantastic :)
Does anyone know about the Oak House, for example, compared to the other more expensive schools? I wonder why their prices are so different. Any recommendations, good/bad experiences with the IB in Barcelona International schools?

Thanks for your help!
Barbara