I can only really recommend ones that I have used, but will suggest one that I haven't too. At present I am using a Zesto Andros and it is really quiet. Really nice sound and I love that the settings can all be controlled without having to open up the box. The Zesto is more than what you want to spend though, otherwise it would be a great option. Before the Zesto I was using a Sutherland Insight (solid state). It was also very quiet. Not as musical as the Zesto, but really good and it's priced at around $1500. The next step up would be a Sutherland 20/20. I think those are around $2300. I have not listened to one, but that is probably the sweet spot in the Sutherland line. I would try one of them from a reputable dealer that has a generous return policy.
Jason
Jason