1. A system comprising: a processor; and a computer readable storage medium having encoded thereon a program of instructions for integrating resource capacity planning and workload management, that when executed by the processor, causes the processor to: access a simulation module to receive simulation data related to execution of the workloads, resource types, numbers, and capacities, the resource types including full usage rights resources and limited usage rights resources, wherein full usage rights resources are those for which the computer system has full rights, wherein limited usage rights resources are instant capacity resources and temporary instant capacity resources, and generate one or more possible resource configuration options; access a modeling module to receive the resource configuration options and determine, based on one or more specified criteria, one or more projected resource allocations among the workloads; and access a communications module to receive the projected resource allocations and present the projected resource allocations for review by a user.