There is no single best POI to download as you need all of the road warnings available.
If you become a member you are able to download some POI files for the whole country which can save some downloading state by state.
Have been a member since 2006 and very happy with access provided..
I am a member also and have recently purchased the Garmin 3590. I don't want to bog it down with a heap of POI downloads, that in many cases may be duplicates.
My post was to see if there was a POI that was highly recommended as it contained "everything" in the one download.