Amp and Pre-Amp suggestions needed

Two points:

I don't like tone controls.  When I had lower quality receiver and speakers tone controls helped a lot.  With better amp and speaker I seldom used them, but now with good gear (I think) I don't need it at all.  Lower quality systems are prone to resonances or attenuated/uneven frequencies.  Perhaps thats why the cheapest boomboxes have equalizers and quality systems don't even have tone controls.  In addition, how to control amount of double bass without changing the sound of the piano in lower registers?  If it was recorded with more or less bass or treble then it was likely intended that way.  At my age I have increasing problem of climbing the stage to adjust tone controls to my liking at the concerts :)

Second point is what kind of sound you expect.  There are two camps - pleasing sound or accurate sound (called by pleasing sound people "sterile" and "analytic").  I'm in accurate camp with Benchmark AHB2, but my brother's system is warm and wonderful.  It does not have resolution (details are masked) of my system, but it sounds very nice.  There is no right or wrong here, but you must state your preference.  In accurate camp Benchmark AHB2 beats pretty much everything within $3k.

Why not go with a beefy integrated such as a Hegel H390? I know it’s not tubes but will blow you away. Otherwise, in your price realm, fo separates, a Parasound A21+ and a tube line stage of your choice gets the job done in your $$$ realm.

If you like the sound with the Vincent separates why not keep it simple and just go with that since it’s a known factor and Vincent makes good and reasonably-priced gear?

Past that, it’s really hard to make recommendations when most of us have never heard (or even know about) your speakers or what kind sound characteristics you like or that are most important to you.  If you could at least share the latter it’d be super helpful in making more informed and meaningful recommendations. 

I'm in agreement with kijanki4 with respect to tone controls. The better your gear, the less you need them.

For a preamp, I would recommend Don Sach's linestage:
http://dsachsconsulting.com/custom%20line%20stage.html

Don builds these by hand and will tweak it to match your amps. The downside is that this means you'll have a 6 - 8 week wait.

I have one and I'd have to spend some serious money to best it.

For an amp, I would suggest looking at a pro amp (e.g., Yamaha, Crown, Crest, Soundcraftsmen, etc.).  

My previous speakers (Martin Logan Spires) loved power so I ran them with a pair of Soundcraftsmen PM860 monoblocks from the 70's. They pushed 900W at 4Ω. Total harmonic distortion was under 0.05%. They were completely silent when no music was playing. If you require big power, pro amps are your best bang for the buck option.

" I'm in agreement with kijanki4 with respect to tone controls. The better your gear, the less you need them."   Thats false.  At 67, my hearing is going and tone controls can be a blessing.