Dwr, what is it that you don't like about your current system? I've never heard Geddes Abbey speakers before, but the rest of your system looks like it leans on the warmish side. Is that your listening preference?
If you don't truly have any deficiencies in your sound, but are looking to make changes for the sake of making changes, then my advice would be to simply keep it as is. But if you need, for instance, more transparency, then maybe moving to one of the ARC preamps or a solid-state preamp such as a Musical Fidelity A308cr, Classe CP-50, Innersound iPre, or a Bel Canto preamp. Obviously, this just scratches the surface in terms of options.
Michael
If you don't truly have any deficiencies in your sound, but are looking to make changes for the sake of making changes, then my advice would be to simply keep it as is. But if you need, for instance, more transparency, then maybe moving to one of the ARC preamps or a solid-state preamp such as a Musical Fidelity A308cr, Classe CP-50, Innersound iPre, or a Bel Canto preamp. Obviously, this just scratches the surface in terms of options.
Michael