I agree with @agedhorse.I suggest trying both the TT the WD and the D-800+, your personal taste is hard to gauge in this context. Just because the D-800+ doesn’t have a tube doesn’t automatically rule it out as a viable possibility to cop the BB-750 like tones.
I recently purchased the D800+ after many agonizing comparisons and research regarding the subway series. The D800+ is a tone monster, and you literally can get almost any tonal quality out of it that you want, especially by learning the boost /cut "gains" of the mids. I used my Sushibox preamp into the D800+ to get that "tubey" grunt and overdrive. It was SWEET. Then, I removed the Sushibox, and after some careful tweeks to the voicing and EQ, I got the same tones out of the D800+ without the preamp. I almost returned the D800+ to trade-up to the TT, but ultimately decided not to. The D800+ is one of the mot versatile amplifiers I have used in my 40 years of playing. And tonal excellence aside, you get an adjustable HPF, Balanced DI output (pre or post) tuner output, an input mute switch, bass and treble boost switches. And if you are overwhelmed by all the knobs on the front panel, you can just set all the tone knobs to "noon" and turn the voicing knob back and forth. . . you'll find a position that works for you in about 3 seconds. This is a truly wonderful amplifier.