We're looking at outsourcing a few of our non-secure applications because management is unpredictable. They will, without any warning, just decide they need to

We're looking at outsourcing a few of our non-secure applications because management is unpredictable. They will, without any warning, just decide they need to give x group of employees a computer and we'll have to add 20 computers to the network within the next week or so. Given that volatility we need to be able to scale quickly on the server side. That's led us to EC2 but we need a database for all those instances to pull off of. Oh, and thanks for the suggestion :)