Rumba,
I found the 250 to be more refined then my earlier pair of 360 amps and the 250 is fuller in the bass at low levels. If you were planning on upgrading from your 180 S2 I would go with a 250 or upgrade your pre amp to a 30SL W/Gen2 modules or the new 30SS. If you have a DMC-20 or standard DMC-30. The pre amp upgrade will provide better overall results then a amp change.
I found the 250 to be more refined then my earlier pair of 360 amps and the 250 is fuller in the bass at low levels. If you were planning on upgrading from your 180 S2 I would go with a 250 or upgrade your pre amp to a 30SL W/Gen2 modules or the new 30SS. If you have a DMC-20 or standard DMC-30. The pre amp upgrade will provide better overall results then a amp change.