I literally just researched hotels in Savannah for a trip I took in March and while I was there researched the other hotels I didn't choose so I'd have some resources for a second trip. See what you think of these--
The Courtyard Marriott – great, clean hotel with excellent service. The stop to the public bus is just a five minute walk away. They also have an excellent staff, too.
The Eliza Thompson House– lovely little B & B type hotel with excellent rates (under $200/night). Very, very centrally located, although you may have to walk a few blocks to get the bus