Unless an abundance of internal storage is a priority for you, 32GB should be enough. This model packs some great hardware with a 1.8 GHz octa core processor.
From Amazon
Samsung Galaxy A02S - Smartphone 32GB, 3GB RAM, Dual Sim, Black
Clove Technology
Samsung Galaxy A02s
EE Store
Samsung Galaxy A02s 32GB - Black
OnBuy
(Black) Samsung Galaxy A02s Dual SIM | 32GB | 3GB RAM