Two ways to view your decision:
1. Obey your desires, they will lead you to a wonderful adventure, peace and prosperity, your itch will be scratched.
2. You need >98dB/2.83V/m speakers to use a 2.5W amp.
If you want a great little tube amp for fair (low) price, check out PrimaLuna Prologue 1. BSA sells them. Reviews claim it is a little warm but very satisfying and good value, well built. Easy tube swap, automatic bias, any tube works.
Now be honest, do you think (in your present condition) that you're ready to add tube rolling to the existing nervosa?