This is just a perspective comment. I would always concentrate on what preamp I want in my system foremost. It is the primary driver of the character of the system… the centerpiece. Then I would want to get a complementary amp. Given you have amps you already want to use, your question makes sense. I guess, I would still look for the very best preamp you can possibly afford, one that reflects your tastes in sound. Then, if for some reason your amps are not complementary, swap them out.
For most of us, pursuing high end sound was not something we could do in one jump, but something to work at for decades… so each purchase ultimately was temporary… maybe for a decade at a time, but temporary. The trick is to reach a really good plateau where all equipment is complementary and synergistic and enjoy it for a good long while. So, sometimes you might think you just about got it… then the new piece throws something out of wack and another adjustment is necessary.
So, I guess my recommendation is to think about a preamp independent of your amp. Get the very best you can, then see where you are.