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Are you keeping the loudspeakers? Always recommend starting system building with loudspeakers for multiple reasons. Then the power amp can simply be seen as the device to get the best out of the loudspeakers. If service and reliability are issues, recommend looking for a good bricks and mortar store to help you.
Tons of questions to sort through: budget; preferred genres; listening habits (quiet, solo, near-field); and room (size, shape, treatments, insulation) to start with. Suggest prioritizing the room and matching loudspeakers to all of the above. Recommend reading Floyd Toole's "Sound Reproduction" 3rd edition, the consummate audiophile guide for learning how loudspeakers/subwoofers behave in-room.