>>The only concern I have is how much I will benefit from the upgrade in light of my source gear and amp. Take a look at my system. I'd appreciate any advice offered.<<
On the flip side of Tylercoupe's comment, imo, your system could benefit more with an upgrade from the PH7 to the Ref Phono 2 (SE or original) than from the REF5 to the REF5 SE. Among other things that allows running a fully balanced system and would be a decision independent of amp/speaker synergy. My rig went from the PH7 to the RP2 and I have not looked back. My preference is to evolve my system such that no one component steps well beyond others - but that's just me and not a criticism of the positive 5SE move. Again, different dollars of course.
On the flip side of Tylercoupe's comment, imo, your system could benefit more with an upgrade from the PH7 to the Ref Phono 2 (SE or original) than from the REF5 to the REF5 SE. Among other things that allows running a fully balanced system and would be a decision independent of amp/speaker synergy. My rig went from the PH7 to the RP2 and I have not looked back. My preference is to evolve my system such that no one component steps well beyond others - but that's just me and not a criticism of the positive 5SE move. Again, different dollars of course.