I guess that answers my question...keep the RV8 and ride it till it dies.
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I don't think anyone responded because they don't have direct experience with your device.
You mentioned "Logic7" as a plus for your current Lexicon. I think the only option I can think of that has reportedly pleasing music surround modes is the Meridian 861. You can pick up a used one and they are still up-gradable and supported to this day. The possible downside is that the 861 unit can be as old as 20 years (or it could be 5-8 years, depending).
If you're just looking for another new general replacement, try an Anthem AVM60 if you want room correction. Or something else depending on what features you want for audio (i.e. automatic room correction, parametric eq, high end audio stages, high end discrete audio stages, etc.). Your budget also has influence.
Most all processors will have a DTS:Neo Music surround mode. I'm not sure if this is going to fit your needs or if it is going to be as good as Logic7 and/or Meridian music surround modes.