Optimise your hardware. Do not over-provision your hardware.
Your existing hardware can be optimised to achieve your goals in the least possible cost, maintaining the strict service levels that you have set for yourself. With proper virtualisation and/or use of the cloud you may find that you have already over-provisioned your hardware, and it can be used for much more.
Contact us to help you optimise your hardware. You may be able to add-on new applications without increasing your existing hardware.