I suspect the best way of getting really good sound from tube amps without spending too much is with simple low powered single ended pentodes.Which might be only 2 or 3 watts but they can sound superb with high efficiency speakers.A lot of the more affordable medium powered push pull tube amps I have heard can sound pleasant but are also pretty low resolution and tend to make everything sound a bit "samey".You tend to tire of that sort of sound.
