Costs: check out AWS's economics center. They have a monthly calculator and other resources you might find helpful.
Scaling: If you're looking for a solution that scales automatically to accommodate an extreme range of variable load (0-10,000 simultaneous users), TurnKey might not be right for you just yet. TurnKey currently caters more to the simple low-end of user needs. Auto-scaling cluster configurations consist of banks of multiple instance layers (e.g., load balancing layer, application layer, database layer) and are currently much more expensive to run even at minimum load.
We do plan to look into supporting auto-scaling cluster configurations eventually but if you need this right now you may want to look at a high-end solution provider such as RightScale. I think the minimum load is 5 servers though.
AWS Costs + TurnKey lacks auto-scaling
Costs: check out AWS's economics center. They have a monthly calculator and other resources you might find helpful.
Scaling: If you're looking for a solution that scales automatically to accommodate an extreme range of variable load (0-10,000 simultaneous users), TurnKey might not be right for you just yet. TurnKey currently caters more to the simple low-end of user needs. Auto-scaling cluster configurations consist of banks of multiple instance layers (e.g., load balancing layer, application layer, database layer) and are currently much more expensive to run even at minimum load.
We do plan to look into supporting auto-scaling cluster configurations eventually but if you need this right now you may want to look at a high-end solution provider such as RightScale. I think the minimum load is 5 servers though.