MSilvia:IMHO, you've made a step up in nearby potential dive sites, not a step back.
Off the top of my head, the following sites are good ones to consider as an OW diver. If you get more experience, there are a lot more than these!
Wreck of the Romance
Wreck of the Kiowa
Wreck of the City of Salisbury
Outer Brewster Island "Canyons"
Strawberry Ledge
Graves' Light
Green Island
3 1/2 fathom ledge
Harding's Ledge
Roaring Bulls
If you're willing to head a bit further south, there are a bunch of great sites off Cohasset and Scituate too.
Thanks for all the sites. I had no idea there was that much variety around Boston Harbor. Maybe we're too parochial up in Cape Ann thinking it's the dive capital of New England.
I checked the Boston Harbor Diving website and they had lots of dive locations listed, most of which you covered. I'll have to get out the charts this winter and do some planning.