I am curious as to what sort of goal you're aiming for with this addition.
If you just want a good sounding DI, there's none better in that range than the Neve RNDI, well under your budget.
If you want a preamp, you want clean or dirty? Tube or transparent?
Cleanish to dirty and tube sound: Shift Line Olympic. Great EQ options, colored sound, amazing end result.
Modern and clean? Maybe the clean side of a B7K Ultra? And have the overdrive on standby?
I think you can cover a lot of ground with the Shift Line, or just an RNDI (what I use)