Here the explanation:
The CRAZY thing is that in the meantime my wife has now decided to learn acoustic guitar !!
That's why I have enlarged my query for the best setup from "for me" to "for us" now....But as she will be playing an acoustic guitar, the need to have an amp/ speaker etc...for her (with or without me) is less important.
However as I had not finalized my choice I wanted to include this option in the mix.
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Meanwhile I start to understand the whole thing with modeler, amp, FRFR etc....
My choice is now:
A/ For me:
1. Headphone situation:
HX Stomp with my Sennheiser HD660S and Shure 535 IEM. Both should work in terms of impedance with the HX Stomp and will not need an additional headphone amp I suppose.
That way I can start to learn all this modeler software, effects etc...while also learning how to play a guitar.
2. Living room situation:
Most probably the FRFR way with a L6 Powercab 112+ if I see that this world of modelling, effect is something that I like to do.
Otherwise a Fender Tone Master Deluxe or Superb.
B/ For her/us:
I will decide in the future. Too early to make a final decision.
Next Saturday she will decide on her guitar first. Seagull, Godin or Taylor.
THANKS to all the feedback I have received!!!