I sense that you have a case of the tweakies.
You don't mention having any SACD software so I take it you don't. I have spoken recently with a few long-time SACD users who are selling their units and investing in very high-end redbook. The concenses with these guys seems to be that SACD is ok, but not that much better to warrant a new library (which is limited) of music in another format. But everyone is different. Metralla makes a very good point about other components in your system. You may get more for your money upgrading another component.
You don't mention having any SACD software so I take it you don't. I have spoken recently with a few long-time SACD users who are selling their units and investing in very high-end redbook. The concenses with these guys seems to be that SACD is ok, but not that much better to warrant a new library (which is limited) of music in another format. But everyone is different. Metralla makes a very good point about other components in your system. You may get more for your money upgrading another component.