Okay, thinking it over for the last hour, I now have a concrete statement to make about my willingness to donate to SIAI. I promise to donate $2000 to SIAI in a year's time if by that time SIAI has secured a 2-star rating from GiveWell for donors who are interested in existential risk.

I will urge GiveWell to evaluate existential risk charities with a view toward making this condition a fair one. If after year's time GiveWell has not yet evaluated SIAI, my offer will still stand.

[Edit: Slightly rephrased, removed condition involving quotes which had been taken out of context.]