Wasn’t aware of olives committing adultery, but as for the best types to use:
If you are only going to use the oil in COOL or COLD applications, such as salads, use Extra Virgin, as it has more flavor.
If you will be using it for frying, grilling or other HOT applications, use Extra Light. The solids in EVOO will SMOKE when you heat it. The ELOO, which has no solids, will not.
I did see a bottle of EVOO from Italy on the shelf at the Giant for sale for $48.00. It was a highly recommended salad oil.