Last time I had to start a m1.xlarge instance and pay more, instead of a cheaper and new m2 or m3, I don´t remember, because that Plesk AMI didn´t let me, I need to upgrade my ec2 instance, I´ll start another m3.xlarge running a snapshot just to be sure that I´ll be able to change the instance type to m3 when I shut down the current instance.