Help selecting a new preamp

Don Sachs Model 2 preamp or one of the new generation of Suprateks would be excellent and leave you some money for other upgrades. A good preamp will make a significant difference in your system, at least in my experience. I have owned two Suprateks and currently own the Sachs preamp, and can attest that either would be a great choice.

@markusthenaimnut --  I wish I could give you a more detailed comparison, but I have only had the Sachs preamp for a couple of weeks and am still waiting on Don's KT88 amp--which I also ordered-- to arrive. In the meantime, I've been using a pretty old, pretty cheap solid state amp with it, and the sound is surprisingly good. Even with these limitations, my first impressions of the Sachs preamp are positive. I can only imagine how good my system will sound once the amp arrives.

It has been about ten years since I had the Supratek, one of the few pieces of audio gear I regret selling. I am confident that Mick's latest iterations of his design are even better. 

I think it is highly likely that they sound more alike than different--very liquid, layered, dynamic, and musical. I have always been partial to preamps that employ the 6SN7 tube.

I doubt this is very helpful, but it's all I got for now.

@gryphongryph 

Yes, I absolutely would, both in terms of build and sound quality. These are two outstanding designers.