SI is ok for east coast but must be combined with Windguru & along with local knowledge of how the bars are lined up (or not) along with swell direction on any given day.
Surfline for cams & SoCal, and sometimes Surfline gets the east coast correctly, but they rarely take into account the wind factor, relying heavily on swell direction / size alone for the east coast (which I find to be an odd way of forecasting, but what do I know).
MSW is better for Central America than SI. Same for Caribbean.
Surfchex has some nice HD cams for when I'm stuck at the desk.
Windguru is a must for any surfing effort on the east coast, IMHO.