Suggestions for low powered tube amps for Zu Omens

I have decided to take the plunge in some type of low powered tube amplifier for my Zu Omen for late night listening. Declare, Oddwatt, Bottlehead, Elekit, are some of names I have researched. I would be appreciative of any guidance/ suggestions you might have. I have no issues with a kit if it keeps the cost down.. actually that even sounds kinda of fun. I also like the idea of buying or building a low powered amp that can be converted to Mono, if I like the sound.