I am in exactly the same dilemma. I gave up a build of the original F5 after I realised how much was the output wattage. I had, all along, thought that it does 35W (which I thought is just about sufficient to drive my speakers), but apparently it does 25.
So I was elated when I heard about the V3 version that does 100W. And that's where I had pinned my hopes.
I currently use an 80W Class A SS amp, and though not the best or the most refined, I really love the power reserve that can be called upon during louder transients. I am bit apprehensive that a 50W could be a downgrade in terms of reserve power.
Let me mull over this for a day. Will let the group know if I am in or out by tomorrow.