"Hey all" works too! I probably use "you all"/y'all/guys about evenly

Once you mix something else in and stop saying 'guys' practically every time, it's hard to go back.

Being from Seattle, I don't have the habit of saying "y'all" but I recognize its utility. I like it much more than "you guys." I guess the Northeast equivalent would be "you's."

The worst thing ever is the second-person plural possessive that you hear on the West Coast: "you guys's." The correct word is just your but in the process of searching in vain for an unambiguous plural version we've created a monstrosity.