IME. At the more budget end of the market, you generally have to make compromises. It's possible you might get what you want from the right Valve Amp, like Puresound....which can give excitement with smoothness. Maybe worth a try.
You also might consider Hybrid Amps, like Pathos, Croft and Unison Research Unico or SS amps like Electrcompaniet, Abrahamson, Arcam (A39) and Audio Analogue.
A warmer amp, with a clean sounding speaker (like ATC, Tannoy, Focal, PMC, Proac), could also give you what you are looking for.....but requires a bigger budget.