OK as mot of you know we are manufacturers of tube audio products. Point-to-point wired using the best parts. Most of the suggestions above are safe choices but all have advantages and disadvantages meaning they are all built to a price point.. Depending on your price point We could send you something to hear or my recommendation would be to buy a used Counterpoint SA-3000 and send it to us for a complete upgrade. We just finished one and it was really killer. Customer transformer, audio note resistors and capacitors, nichicon capacitors, V-Caps, etc. This is as close as you will get to reference sound without spending that much.
We have a listening room in Northern New Jersey with Sonus Faber, Vivid, Horning, Vandersteen Sevens and 5As so we can to hear many options and how they interact. We also repair and modify components so we get to hear more gear than most of you have ever heard in a your system in 20-30 years.
Plus we can build you a preamp to what ever tube or specifications you prefer.
Happy Listening,