That's why since I got my speakers I've been ignoring all of my headphones almost completely. And in DIY I'm more oriented towards DAC building while headphone amps are all but forgotten. A good DAC can be used with headphones or speakers while headphone amp's usefulness is quite limited.
Incidentally, I'm considering getting Music Fidelity A3 integrated amp once I have money. Of course I have yet to audition it but since for the price it offers dual mono... I could build my own but it's too much trouble... maybe in a year or two.