Best integrated/power amplifier under $6000

Looking for either a power amp or integrated amplifier with at least 150 watts in 8 ohms for under $6000- new or slightly used. What would you recommend? I would be using my own DAC with volume control - so just need either a power amp or intergrated without a DAC. Please share your recommendations for the best amp you have heard which meets the above requirements. 

Thank you
yyzsantabarbara, the Luxman L-509X integrated amplifier did not ever sound different from new out the box to 600 hrs, the Krell continues to get better from new to  300hrs and continues burn in , the Krell kills  the Luxman with uncanny clarity,  mid range,  sound stage size and depth, bass, and does not distort at loud volumes as the Luxman gave out at large volumes with distortion,  the k 300I best suit is clarity without losing musicality,  and the sound is not warm, rather in between warm and cold, the other mention here is I don't get listener fatigue with the Krell like I do with Luxman,  the Rega osiris was a nice sound but didn't have the treble detail or the clarity as the Krell, however,  the Rega sounded better than the Luxman,  reget selling the Rega,  didn't need two integrateds, cheers. 
@audiolabyrinth  Thanks for your feedback on the Krell vs Luxman. I have 12+ hours to kill in Los Angeles in the first week of June. You have now given me something worthwhile to do. I know where to hear the Luxman but need to find a Krell XD on demo somewhere.
It would be interesting to hear how the Krell compares to my L-590AXII. After going through a dozen integrated amps in the last 4 years, I have not heard better.

$CAN 5600 = $USD 4166