Here's another thought - PrimaLuna ProLogue three preamp - Smooth warm tube sound, but not syrupy. Also, the tubes are auto-biasing so you don't have to be a multimeter jocky to get it sounding right. Look for one used in your price range.
Or, Modwright SWL 9.0SE
In the solid state world, look at a used Classe, Nam NAC 112, Primare Pre30, or a budget fly in the ointment, the new NAD C-165BEE, which is really quite good.
Or, Modwright SWL 9.0SE
In the solid state world, look at a used Classe, Nam NAC 112, Primare Pre30, or a budget fly in the ointment, the new NAD C-165BEE, which is really quite good.