If you can work with MySQL, then you'll get a much cheaper plan with a reserved instance of Amazon's RDS.
Besides being MySQL under the hood, which has known flaws compared to PostgreSQL, with Amazon RDS you get to be completely worry free. You can also do backups on Amazon's S3 and setting up a replicated slave is literally just a push of a button.
Besides being MySQL under the hood, which has known flaws compared to PostgreSQL, with Amazon RDS you get to be completely worry free. You can also do backups on Amazon's S3 and setting up a replicated slave is literally just a push of a button.