Accuphase E-460 vs Luxman 509u vs Moon 700i

And of course you want a great midrange. And some bass, your speakers can go quite low for monitors.
I have never heard your speakers so I will just list other brands you might want to consider.
Rowland, Pass, Gryphon ( no dealers in the US ) and Redgum.
I have Redgum integrated and like it a lot. I also like better Purist Audio cables.

Kiza, do you have to buy an integrated? If you're open to a pre/power combination, based on your stated budget and preferences, i'd recommend the McCormack DNA-250 power amp & LD-2 preamp. RRP for the DNA-250 is $3995 & $2495 for the LD-2. The current line of McCormack amps are designed and built by Conrad Johnson & in my view are some of the best value high end amps anywhere. They have prodigious power, warm sound & airy extended highs, and according to one of my friends they are musical sounding also. Here is a link to their site fyi - http://www.mccormackaudio.com/index1.html

LFD integrated MkIV. It is excellent. No frills but terrific sound.

If I recall, Sound by Singer, an audio dealer based in New York carries LFD.

Right, I forgot LFD. There are a few models.

Kiza, did you ever make a choice? I have the Fritz Carbon 7 too so I was just curious if you found a good match for your system and your thought on the sound. thanks.