Education (Riyadh)

Hi there, I am new in Riyadh and my two boys will be joining me as soon as I get my Iqama. Their mother will be coming here too.
Can someone with school-age kids please let me know which is a good school for my two boys. We come from South Africa and get no education subsidy. Therefore need somewhere not too expensive. To me, a family environment at school together with good education is more important than the name.
Could you please advise what my options are.
Thank you,
Martin