Start small with two maybe three micro instances. Try to scale out rather than up. When the time comes you can step up to the larger instances. You might wan

Start small with two maybe three micro instances. Try to scale out rather than up. When the time comes you can step up to the larger instances. You might want to separate some of your services into clusters and run them from a couple sets of instances. A couple of micros for the front end and a couple for the back end. You will probably save a few $$$ and have more control of your growth.