IIRC Jay has posted before that solid state amps 5 times more powerful than tube power is a rough equivalent, and given that you will be using solid state with FRFR and that the speakers have roughly the same efficiency *over electric guitar frequencies*, you will be in the ball park with a good quality 500W+ FRFR solution.
This is also my experience using an RCF 322A and Matrix 800 live and loud. It has better clean headroom of course, because the point of running high powered SS FRFR is that it's not being pushed into overdrive, it's cleanly reproducing a modelled tone. I'd also agree that FRFR doesn't have quite the same sensation of being surrounded by the tone of a saturated tube amp and stack, often described on forums with vague terms such as "in the room tone" and "moving air".
One thing that's critical to the tone of an FRFR solution is how it handles being asked to deliver more that it can give, because this WILL occur at times in an over-loud band. (I'm interested to know how the CLR manages this). Good solutions will limit volume cleanly to protect amp and speakers, and the compression is a clear sign for a reality check "whoa, that was fun, but let's turn down a bit".