blevine wrote: ... Don't forget diversification, NY was once almost bankrupt, remember
Ford to NY Drop dead !
Diversification is critical, but for the record, it was New York City specifically, not the whole of New York State.http://www.nydailynews.com/news/politics/ford-city-drop-dead-president-snub-inspired-discouraged-ex-gov-hugh-carey-article-1.947295
Granted, any NYS-specific municipal bond fund is likely to include NYC securities, and also granted the state today faces financial challenges.
To the OP: If you wanted to stay with Vanguard and do what you asked, you could mix the NY long-term muni fund with the NY money market fund (practically return-free at the moment) to adjust your average duration however you like.