Without knowing what kind of sound you like it is a bit difficult to make any suggestions, but, if you are just looking for an amp because you already have a dac you are happy with I would suggest what I use for my sennheisers, SMSL sAp 9. It is a great little amp that does balanced and unbalanced and has enough to push everything I have outside of the high end headsets. The price tag on it is about $110 on amazon so if you don't like it you can always send it back. As for tubes, the only way to know what is going to work for you is by buying it, tube rolling and seeing if you can get the sound you like. I don't do hybrids because I don't really hear any appreciable difference even with the Lyr I had picked up. I hope I was able to provide some help and good luck with your search.