I currently have the Sugden SPA-4 power amp with matching LA-4 pre amp, and i couldn't be more pleased. I had a switch go off in my head the other day, and i have somehow convinced myself that i should have the Sugden MPA-4 mono block amps. After selling my current amp, i would still need to spend another $9000.00 on the pair of mono blocks. I am 59 years old now, and looking at this from a financial investment point of view. Will i get my use out of them before i die or lose my hearing etc. I do have 2 wonderful children will inherit all of my audio gear, music library etc. I can afford this, the question is do i need this upgrade? It is more of a want than a need. At what point to i reach the point of diminishing return on this?