The best integrated amplifier


Hi All
Right now I am using a Marantz PM-KI Pearl amp to drive Esoteric MG-20 speakers. I feel that a better amplifier would give them a bit more get up and go. I would like to stick with an integrated and have short listed:
Pass Labs INT-150
Moon 700i
Audio Research dsi150
GammuT Di 150
As a starting point for auditioning. Now to the question:
Is there anything else I should put on the list?
Any experience with the products listed would be helpful.
Thanks
zekezebra
Toronto416

I just received a 509U, have some questions about it (no owners manual, etc), wonder if you would be so kind to answer based on your having the unit.
Ive heard amazing things about the Luxman. That's on my very short list. I'm waiting for the Ayre AX-5 to be released before I take the plunge. You cant go wrong with Luxman. Let us know your impressions.
Well, its been a month. I was initially very disappointed, the music was harsh, hard to listen to. I decided to play the unit non-stop for about 10 days and now find it pretty great. I initially regretted the purchase but after an extended "burn-in" could not be much more pleased. I went for this unit to decrease the number of boxes in front of me plus to have the option of a subtle treble tone control to help make so many CDs listenable. Recommended.
Have now mated this wonderful integrated with Luxman D06 CD/SACD player. Driving a pair of 5A's, will not ask for more.