NHS literature cites 250pmol/L as the minimum threshold for bone protection.
The late Professor Studd cited 300pmol/L.
I would be inclined to go with the latter.
Levels for cardiovascular health have not been defined but my personal opinion is that approximating the average levels seen across a typical menstrual cycle in healthy young women outwith ovulation (very high spike) and menstruation (nobody feels their best that week) is likely to be optimal from a healthy longevity perspective.
This would be somewhere between 300-600pmol/L. Individuals will have their own range at which they feel best.
Me, I feel good around 400pmol/L. I will also be following my FSH (high levels are associated with multiple negative outcomes including Alzheimer's pathology) although this isn't standard within mainstream practice.