I have a Stereomour II and Rega RP6, originally with the Sumiko BPS Evo III HOMC (2.5mv) and Blumenstein Orcas and Subs. When I added the Seduction, I just didn't have enough gain. Always wanted more clicks on the volume. Switched to the Eros and the extra gain was just enough - plus the sound quality goes from really good to really gooder. Switched cartridge to an AudioNote iQ3 (5mV?) and even better oomph.
If you can afford the Eros, you'll be happier. Otherwise, you'll always be looking for more volume. My two cents. What cartridge are you running on your Thorens?
On a slightly different tack, has the Bottlehead team ever thought about a LOMC phono preamp and/or SUT kit?
Happy Thanksgiving!