Stretch the budget a little and spend on the preamp. It is a crucial component. The amp is too, of course but a bad system match where the preamp is the weak point can make the rest of your system sound , dull, bright, recessed, too forward..... whatever bad nasties you can think of can be due to the preamp. It is as important as your speaker choice, it influences the overall character of a system
I’ve got the upgrade itch
Thinking about going back to separates. My current setup is a Primaluna Dialogue Premium Integrated amp. Since the Primaluna has an HT input, I can do the upgrade in two steps, upgrading the preamp first. I am thinking about a 6SN7 based preamp, such as Sachs, Supratek, or, an Atma-Sphere MP-3 (if I can stretch the budget).
Question, will the preamp switch make a big difference over the preamp stage in the Primaluna??