Hi Sarah,
There's a few plugins covering SQL development in Eclipse - mostly tools you need to pay for.
My Eclipse Database Explorer provide a very nice Database Explorer . There's a free trial you can download to see if it matches your requirements.
QuantumDB sounds pretty complete to me.
I'd be interested to see how you get on with the tools, and if it covers all the features that you needed from your previous tools.
Let us know!
James