I was recently chasing a similar thing. I wanted the classic valve amp sound but mostly wanted to use headphones.
It's not 100% valve it's hybrid but I ended up getting an Orange Micro Terror.
So am I happy? Well I also have a very nice Fender Mustang GT modelling amp, a classic Roland JC-160 (the 4x10 version of the JC-120) and a couple of Orange combo amps including a Crush Bass 50 and a funky little Pignose amp. I haven't used any of them since I got the Micro Terror. Highly recommend it. It's incredibly powerful and versatile.
I disconnected the speakers in the JC-160 and attached a 1/4" socket. Plugged the Micro Terror in and couldn't get it past 3 on the volume dial without shaking the whole house.
FYI all the other options I looked at for a pure valve amp were just too expensive and my old ears couldn't really the difference anyway.