Quicksilver tube preamps would be a nice fit with any solid state amp! The low output impedance will work fine with any amp you decide to buy. I own the non remote 12at7 one. BTW, both have no balance or mono feature, if you need that then you should look at something else!
http://quicksilveraudio.com/preamplifiers/
http://quicksilveraudio.com/preamplifiers/