Amp and Pre-Amp suggestions needed

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.

Mcintosh