Are you asking people to suggest new materials for you? If so I think you are on your own as it is going to be very specific to what you are doing.
Once you have found a new material, you just have to update the materials properties from within Simulate.
If you are looking for material properties you could try MatWeb, but be advised that material properties are also going to be specific to what you are doing and the industry you are in. Properties change with temperature and there is a level of risk (S, A, B-basis) that plays into what numbers you use.