If you like warm and smooth some the Sansui's are just that as @Cafad said. The Plinius is Neutral'ish depending on speakers and particularly the source. Another smooth sounding amp is the Exposure 2010s2, budget amp compared to what you have listened to but price doesn't mean everything. 75w/ch, don't forget watts don't mean all the much either (with your speakers anyway). My 38w/ch Sansui pushes my 90dB PMC's loud enough for a big party.
I heard the Tonga at Stereophonic and didn't think it was an improvement on the 9200. I actually prefer the 9200. Chew Cafad's ear off, he'll point you in the right direction