The paper describes the modeling and design of actuators for application in a magnetic vibration isolation system with passive gravity compensation. Parallel to the fully passive magnetic gravity compensation these actuators provide the stability and active isolation required in such a 6 DoF vibration isolation system. Powerful analytical modeling techniques are used to accurately derive the key properties of the actuator and to compare different topologies. The resulting design combines high force density with low cross-coupling and low flux leakage, which makes it very suitable for application in the vibration isolation system.