The SA-102 is definitely more delicate, I would not make the switch, I think you would be going backwards.
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I think you'll find the SA-102 is more delicate and more musical. I personally see no reason to go the 250, I think you'll feel you lost something. I wanted more dynamics with my 102 so I got a second 102 and bi-amp vertically. I would recommend this route first! Both the speakers you are talking about should be fine with the 125 watt amps.