That is a good price on the SLT but I don't know if it is the rod I would choose for Steelhead. The SLT is easy to cast but it lacks the power you need for Steelhead fishing. I think the Sage Z-Axis would be a better choice if you can find a used one. The Z-Axis is a fast action rod and the SLT is a medium fast rod. That is not a good price on the A2 unless it is new. The A2 is also rated as medium fast.
My comments are based on the assumption that you are looking at a used Sage and a new Scott.