I previously owned the 9200; no experience with the 9100
Plinius 9200 sound-
1. somewhat warm
2. somewhat laid back
3. dynamic
4. fairly detailed/resolved
5. smooth midrange/slight tube sound
6. smooth highs w/some sparkle
7. authoritative w/ good bass/ a bit lean
No experience with the Simaudio I5.3 but used to own the Simaudio Nova. The Simaudio "house sound" is detailed, fast, has been known to be a little lean, but very clean clear midrange/ decent bass. Good luck. Don't choose on looks.
Plinius 9200 sound-
1. somewhat warm
2. somewhat laid back
3. dynamic
4. fairly detailed/resolved
5. smooth midrange/slight tube sound
6. smooth highs w/some sparkle
7. authoritative w/ good bass/ a bit lean
No experience with the Simaudio I5.3 but used to own the Simaudio Nova. The Simaudio "house sound" is detailed, fast, has been known to be a little lean, but very clean clear midrange/ decent bass. Good luck. Don't choose on looks.