Terenthia
For under $3,000 I'd recommend the Supratek Chardonnay preamp, $3,000 with chrome accents and $2,500 with black accents. Hand made in Australia, and Mick Maloney is a really smart dude......and great to talk to. That's what I would buy for that price range, and it's a 6SN7 tube based
For $4,000 my first choice would be the Aric Audio 6SN7 preamp, and second would be the Supratek Cabernet (the next step up from the Chardonnay). Both hand made, point to point wired, with the highest quality of components. For disclosure, I own Aric's preamp and amps