I am interested in purchasing my first tube amp, and I was wondering if anyone would care to comment on the differences between these three Schiit components: Vali, Vallhala (I can get one used for $235), and Vallhala 2, and also compare the Schiit tube amps with the Little Dot MK III and/or MK IV. I just purchased Senn HD 600's and mostly listen to jazz and classical. Any DAC recommendation to go along with the amp would also be very much appreciated.