Best KT88's for an Mc 2000 ? Any suggestions

There's no reason for you to spend that kind of money. Mac uses the Svetlana KT88's, which you can get from Kevin Deal at Upscale Audio for $45 a piece, in matched quads. Actually, since the Mac has biasing on each tube, if I'm not mistaken, matching isn't even necessary, but I would still do it. Don't bother with the Sovtek KT88 - not in the same league. You could try Electro Harmonix 6550, which looks exactly like a KT88 and can be used in the amp. It would add a little more detail and treble definition, it that's what your looking for. If you want these, I have an extra set of 8 new ones.

The Tesla KT88 is another choice, although their reliability and longevity has been an issue in the past. Sources tell me they sound similar to the Svetlana, with more treble detail.

Svetlana is a must - I was told by people in the Mac field who should know. Superior to the 6550.
I found that McIntosh charges you a lot of money just for their logo on the Svetlanas! I saw quads of KT88 here on AG for $160!
I had to have changed a KT88 in my MC2000 and they charged me a horrific $150 for one tube!!!
Could anybody tell you how long the tubes in the
MC 2000 will last? I have VERY different opinions on that!
Cheers!

I recently purchased some JJ Electronic KT-88s(made in the Slovak republic) from Quest for Sound and really like them. They were a big improvement over the stock 6550s in my Audio Research CA-50.

The EH 6550 is a good choice.
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