My Linkwitz LX521.4 system uses the latest iteration of the HYPEX Class-D amp modules, 5 for each channel, 10 total (!). Without Class-D technology, I would need 5 (!) power amplifiers to drive the LX speakers (one for each speaker cone): simply unaffordable. Class-D amplification gives you a LOT of bang for the buck!
My preamp is a custom-built SUPRATEK Grange, a two chassis affair with 16 vacuum tubes total. My preferred output tube is the Takatsugi 300B single-ended triode. To your question: I find the combination of tubes and Class-D utterly satisfying, whereby the tubes provide me with air and soundstage-precision and the amps with very fast rhythmic response and amazing dynamics. For me, this is a final combo. Class-D amps have come a very long way (the concept stems from the 1950s) and have overcome all the historic shortcomings I am aware of. I think in a good Audio system, the preamp plays a more important role than the amp (unless the latter is really bad, compromising all other components), while of course, the source (an excellent TT, Tonearm and cartridge; and/or a state-of-the-art DAC), and first and foremost the loudspeakers are of much greater impact on the overall musical experience. But again, Class-D has definitely arrived. Coincidentally, my first higher-end system was built around a NAD integrated: solid performance overall, but a bit - how can I phrase this - "boring". This is by no means meant to be a negative, mind you. I am sure our fellow forists (is that a word?) will have ample recommendations for you and your budget. Best of luck!