I have to agree with the others that Cove 2 would prob be your best bet. It is used by many instructors for classes because of of it's lack of currents and it's gentle slope, but there is still lot's and lot's to see at all depths. Plus, you've got plenty of facilities right there on site...bathrooms, shower to wash your gear, restaurant that serves hot chowder, etc.
While you'll probably enjoy your dives a lot more in a drysuit, you should be fine in a 7mm farmer john and 7mm jacket. Do bring lot's of hot water for before and after your dives as well as lot's of warm dry clothes for your SI.
I did 30-40 dives in the Sound with a wetsuit before getting a drysuit. While it was cold, it's not that bad until you get a drysuit, then you'll never dive up here in a wetsuit again. I did one wetsuit dive last year while my drysuit was being repaired and I kept asking my self during that dive how I ever did 40 dives in a wetsuit.