since you live in Europe, the thing I suggest you do is try a preamp within your budget with a name that sells easily, in case you will not be satisfied and will want to try another preamp. Go used. Find something like an Audio Research, BAT, Sonic Frontiers, Audio Note, Prima Luna, Manley, VTL, etc. Stick to names that sell. Unless of course you can audition at no cost. You don't wanna be stuck with a piece that will be tough to sell.
Good luck!
Good luck!