I have owned the RM-9 and RM-10, but a different points in time. I wouldn't say the RM-10 is a considerable upgrade over the RM-9. They are both outstanding amplifiers. I will say if you don't require the 100 watt output the RM-9 the RM-10 will not disappoint you.
Personally, for SET amps, those suggesting the Almarro might be on to something. It's an amp I've considered before.
Personally, for SET amps, those suggesting the Almarro might be on to something. It's an amp I've considered before.