With your taste and budget, you can't go wrong with the XLO's Signature 2 or Signature 3. The best in tight bass and detail in the high but not harsh. It is made of very pure copper material, so the mid is not bad either.
Used Sig. 2 can be had for less than $450 and the used current Sig. 3 will be around $600.
Used Sig. 2 can be had for less than $450 and the used current Sig. 3 will be around $600.