No threat of violence

Given the assumptions noted so far, the answer to the previously noted question - we should integrate when we are comfortable at the "No threat of violence" level.

Going any further than that would certainly spell doom to our aspirations of longevity and independence - there simply aren't guarantees for a small (relatively underdeveloped) species unless you are fully integrated with a much more capable (group of) species/planet(s) that can provide a guarantee of No Violence on a regional or even a galactic level. And we probably can't afford to wait much past 500-1000 years (no matter how well we manage the balance of societal and technological progress and develop defense-industrial capabilities) - simply because our system happens to have highly thought-after resources of Venus (and probably Mars). Resources that might be in extremely high demand by others who are not as lucky as ourselves (due to their cosmic neighborhood or other more controllable but overwhelming factors).

Integrating at a lower profit-driven level would certainly doom us to loss of resources and exploitation, which with time would force our integration at a higher level and loss of independence (and possibly identity).

Integrating at the level of "Open threat of Violence" would leave us in a confrontation with the peer (in terms of development) species/planets a la Star Trek, in a very high-risk setting. Nobody would be willing to take such large risks if there were better options available.

Integrating at lower levels would be a nightmare that (probably) won't be allowed by the greater forces present (and certainly wouldn't be in our interests).

If the assumptions about the presence of intelligent life in our Solar System and the eventual (500-1000 years in the future) alliance building at a more even level than we might be otherwise forced to are correct then we would enter the Integration phase in a state very beneficial to ourselves (and likely to the greater forces on many sides) with much potential to help ourselves and help build a better neighborhood and eventually perhaps a better galaxy.