I have an ASL Orchid 2A3 integrated (3.5W/ch) into Coincident Triumph (94 dB, 8 Ohms) in the bedroom system. It sounds lovely at about 80-85dB in a 16x25 room. Obviously not much deep bass but the mid-range is very transparent and upper end is very liquid and clear. Vocal and small band Jazz sound great.
So the three main issues are
1) type of music
2) volumne level desired
3) Room size
If you do go with SET, adding a powered sub can help very much. You will need a tape-out loop into a cross-over to filter out bass from the amp. Send the bass to the sub. So the SET only amplify from 80 Hz and up. You can also try it through speaker level as well, but I think line-level would have better results.
So the three main issues are
1) type of music
2) volumne level desired
3) Room size
If you do go with SET, adding a powered sub can help very much. You will need a tape-out loop into a cross-over to filter out bass from the amp. Send the bass to the sub. So the SET only amplify from 80 Hz and up. You can also try it through speaker level as well, but I think line-level would have better results.