Playing around with the calculator, you're roughly on track with an r3.x4large - most of the Linux options happily bundle far less RAM.
Getting 9TB of EBS on top of that puts the bill at $1516 per month. None of that accounts for traffic, of which we know nothing about.
The thing is in an Amazon world, you could optimise the setup for an Amazon deployment. For example, you'd probably move parts of that data, like database snapshots, onto S3.
Those costs are still nothing to sneeze at, and very likely suboptimal.