Secondary Savings account

I want to open another bank account where I wish to build a significant cash position (with about 5 months of my salary). I will use that money incase of emergencies or if I need a lot of cash, so that I don't have to exit any stock positions or mutual funds if I suddenly need money. The corpus will be created over time ofc. I wanted to know which is a good bank to go ahead with? I don't have a problem with a non zero balance account, all these banks offer a shit ton of options and benefits and I am confused. So, good people of grapevine share your wisdom. What would be a good choice with decent benefits.