SteveW13,
Each State may have different minimum levels of insurance contained within their HOA and/or Corporate laws. Since California is covered under the davis-stirling act, I went to
Davis-Stirling.com and looked under Insurance.
Per their web-page at:
http://www.davis-stirling.com/MainIndex/RequiredInsuranceLevels/tabid/3093/Default.aspx#axzz1UGg7MLqo the minimum level of D&O insurance will depend on the number of lots you have in your Association. As I read the page, you will need $500,000 if you have less than 100 lots. If you have more than 100 lots you will need 1 million dollar policy. If your Association likes to file legal actions against the board, you might want to consider higher amounts.
You should get multiple bids before settling on an insurance company. You may want to try an independent insurance agent who represents more then one company.
Tim