T, I think that your original question was more realistic than your second proposal. Neither the speaker that you mentioned for your father nor the Infinity that I linked(check the Stereophile review and measurements )should be considered as "lame". Your M22/STF-2 combo is excellent and except in a very large room(which you don't have)actually getting a significant "upgrade" for the money that you're considering doesn't seem very likely.

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Enjoy the music, not the equipment.