When in push/fold territory, you want to be the FIRST person to give action(Much easier to win hands heads up than against multiple players). < 5 BB push ANY ace, K5+, Q10+, any pocket pair
< 10 BB push any A10+, K10+, 77+
10-15BB push any A10+, KJ+, 99+
You don't need to worry about suits as much when you are in push/fold territory as the goal is to make the hands heads up, reducing the significance of flushes.