Best integrated up to $6000

Didn't know any VAC was available anywhere near 6k, sweet

I'd audition the class A Luxman and the solid state Luxman for full featured amps, the Audio Research or CJ if you like tubes. I know all those well and any would make a strong man weep if matched to your speakers.

People rave about the Diavalet, but I haven't heard those

Erasto,
You have initiated around "20" threads seeking "what's the best" in various product sectors. You have never followed up on any of these threads publicly. Just curious, what do you do with the suggestions many have taken the time to offer you?

The avatar can be had for around $2500 give or take used I've been waiting for one to pop up myself.

Ghasley/Erasto-Unless someone is in financial distress a properly working ARC VSi 75 or VAC 160i cannot be found for <6k. I mentioned the MAC-MA2275 because this is the best tube int. I have heard at $4500 (retail when new). Mastersound(Italy) and Audio Space(China)make some highly acclaimed units that fit into the specified $$$ point, but I have not heard them. The ARC VSi 55 fits(price point) but IMO the MAC MA2275 is the more musical(tube like) of the two. I would sacrifice some detail/resolution of the ARC for the build quality and resale value of the MAC.

Dayglow, you are correct about the Audio Research VSI75 and VAC 160 being above the price point mentioned when new however I have seen both listed for sale here on Audiogon near $6,000 from time to time. The ARC VSI60 is probably the amp to consider as the VSI55 has been out of production for a while and was nowhere near the performance of the 60. Of course the VSI75 is extraordinary and frankly gets real close to the reference series performance. Now to the Mac....the retail was $6,500 when new if I recall but used is much lower....it would be a reasonable value at $2,500 used but it is sloppy and muddy in its presentation, no offense intended. The Mastersound amp are really cool and very tubey if you enjoy the euphonic presentation they so wonderfully reproduce.....love the Italians.

If you must buy the Mac 2275, do not expect the amp to perform like the 275 amp which is terrific. I have owned two 2275's because I totally loved the look, the sound just didnt live up to the look.