Ah Savannah. What a lovely city and soon it will be at its most beautiful (once the azaleas and such start blooming). I love that town. Good eats, great kayaking. Anyhoo....this year I am definitely going to dived there. Have tried twice, but both times, the trip was called on account of heavy seas.
Scubachick - an additional dive opportunity you might want to consider is the Cooper River about an hour north of Savannah, up around Charleston. They are kind of fun in that you are guaranteed to find lots of fossilized sharks teeth, maybe some cultural artifacts, and the diving experience itself is kind of exciting and unique in that it is serious blackwater. Like maybe 5 to 30 inch visibility with a decent light. Of course, not everyone enjoys that sort of thing, but if you have the right attitude about it, it can be sort of addictive. In Savannah, btw, make sure you go to the Ocean film festival. There are films and talks and all sorts of stuff you'd be interested in. It's a 3-day affair, probably in September.
Seatiger - re Kraken's comments, I work at the new GA aquarium in Atlanta along with a ton of other divers. We have a Gray's reef exhibit and I am hoping that I can generate some interest in a group trip(s) this summer down to the coast to see in person what we normally look at and talk about through a 2" Acrylic window. What time of year, btw, does the water become sufficiently warm for a reasonably comfortable 3 mil dive and, independent of apparel, what times of year would you say are best for diving down there both in terms of the scenery/vis and probability of the dive not being called due to weather/seas?