I second the Synthesis, Leben and Audio Hungary recommendations. Another nice brand I have experience with is Triode Corp, Japan (not Triode Lab, Canada). If you want to go even more upscale, Octave Audio makes some beautiful gear.
I have 3 tube integrateds:
1) Triode Corp TRV-35se (EL34s)
2) Leben CS600X (EL34s)
3) Synthesis Ensemble (EL84s)
I love all three. The Synthesis drives my AN-E LX Signatures, and as others have already noted, they are a wonderful combo - really relaxed sound, without loss of detail. No sub out on any of mine however.