I have some experiences for you. The tube box SE is killer sounding, you get a low noise floor and the bloom of tubes, it's great sounding and cheap in comparison to others. The musical surroundings nova is also very good sounding, it has lower level detail retrieval and a blacker background than the tube box SE, it's also a litter darker sounding (in the mids) with less bloom, the bass has great control and the treble is very clean. Rogue audio Aris you can buy used for around that price and it betters both of those, it's just amazing sounding, with a huge soundstage and great layering, and musical enough you can listen for hours and just get lost in the music.