HELP!!! I need a “GOOD-CHEAP” preamp solution???

I would appreciate the community’s thoughts about replacing my NAD C356 BEE integrated amp (it’s being used as my preamp) in my modest but nice sounding 2 channel audio system. Why replace the NAD? The remote no longer talks to the amp, I’ve already replaced the large pc board ($275) and it’s running hot with a dark brown spot on the blue pc board. Scary. 

Ideally, I’d like a tube preamp as I enjoy the “warmer” side of neutral. Laid back, spongy, non-fatiguing highs, meaty bass is me. Fast, accurate and transparent need not apply.

The digital source includes an older Theta Carmen cd transport to a Cary Audio dac (100 t) with a pair of vintage Mullard 6922’s in the output stage. Off to the NAD to a $400 Emotiva A300 (150w) amplifier. It’s a high gain (28db) and a bit forward/bright with my speakers. The speakers are my first pair of bookshelves. A recent move found the new man-cave just 11’ x 11’ x 9’. They are a nice pair of Focal Chorus 807 V W Prestige bookshelves. A sealed SVS SB-2000 sub fills in the blanks for the Focal bookshelves. Where’s the warm, analog tt you say? It’s coming. Zu Audio rca’s/speaker cabling with Acoustic Zen interconnects and AZ power plugs. 

Now, the big question. I know there’s a ton of options out there. But, what direction to go? Need to think budget (let’s say <$1500) Does a guy gamble and go vintage tube pre or SS used??? Is buying a 90’s preamp risky? For example, a CJ/AR/PSAudio/Classe/McCormick DNA etc. What sounds good? (I know, I know) is reliable and fun to listen to. A pre that might have good synergy with the extended highs and metal tweets (Al/Mag) of the Focals???

Is there a good used, inexpensive and dependable “sleeper” of a preamp (ss or tube) that you like???