Are you looking for a mic exclusively for interviews or would you like it to also serve as a boomed mic for narrative work?
For an interview only handheld mic check out the Electro Voice RE50N/D-B, a micro budget ENG "standard". It will not work as a boomed mic.
BTW, to a guy like me $500 would be a "not break the piggy bank" price range, so a mic like the Audio Technica AT4053b would be my first recommendation for a general purpose hypercardioid. In the future please give your budget.
Oktava Mk0012 - about $300
I think Im getting Cardioid used inside where fairly quiet, you get a broader pickup pattern and little ambient noise, Hypercardioid outside or when you want to deflect ambient noise and hyper has a smaller pickup pattern.
Supercardioid is somewhere in between ??