How good is the Technics 1200 Mk2 with all the KAb upgrades?

I had the same KAB mods on mine and liked it a lot.  I sold it when I bought a new SL1200GAE, which sounds a bit better.  Not a huge difference, but it you want the perspective, spend $4,000 on a new SL1200G and it will sound a wee bit better than yours.  Now let me bracket it.  I also have a VPI Prime, and it too, lists for $4K.  Stock I think yours would be very close to the Prime.  If you spend about $2K on mods the Prime is going to sound better.

I just installed the DC-1200 20v Regulator, it removed any noise I could hear.  Like the Strobe Disabler, only far better.

I have a KAB modded 1200 with isonoe feet, damper, 78 rpm, an Achromat and upgraded headshells.  He was still working on the tonearm rewiring when I bought mine so I didn't get that done.

Since you bought yours, Kevin has come up with a couple more minor tweaks but nothing essential.  I think you have a great turntable now.  Only thing I would upgrade is the mat.  Herbie's mats are good too.  Both are available with a return policy so not much to lose by trying one.

I never thought clamps improved the sound on mine but YMMV.

I just put a Hana EL cartridge on mine and it sounds better than anything I have had before.

I bought my table many years ago when my old table broke down.  It was going to be a stopgap until I could find a "real" table.  From reading reviews online I was sure I wanted a VPI, a Scoutmaster, the one that "HW hit so far out of the park it isn't funny" as one writer put it.  The Scoutmaster turned out to be the only turntable I have ever completely disliked.  Wonky unipivot tonearm and anemic presentation of music really put me off.  Checked out a number of other tables as well and came to the conclusion that I would have to spend over $4000 to considerably improve on what I had. 

I was going to buy the 1200G but the upcoming SP 10R is messing with my mind!

Let us know what you think when you get yours going.  If you decide to sell it I don't think you will lose any of your investment.

From someone who has owned an entry level project, Original VPI Scout

Currently I have a VPI Prime and a 1200mk5

I would lean towards keeping the KAB 1200. Reasons is simply money. You will be looking at a Prime used to have something maybe a little bit better or just a slightly different flavor.

My Prime and stock MK5 are pretty close. The Prime has better left to right Imaging and soundstage (not a huge difference). A smoother sound which you appreciate in longer listening sessions. It has a bit more round/fat bass as compared to the 1200. It has maybe a touch better resolution. Depth seems similar in my setup. 

Saying all this it could just be the cart differences as I have not done apples to apples comparison.  With all the KAB mods I could see Bill Stevenson opinions being pretty accurate. 

As I learn more about this hobby I realize at a certain point you have to devote longs listening sessions to discover if something is really an improvement. Stuff at these 4k price points sound more alike than different. The small differences are what we are paying for and choosing. To many these subtleties are worth it, to some they are not your choice. 

Time and money wise, changing out the 12xx arm to the Jelco is pretty darn easy.  It's a DIY project taking about 2 hours. then the 12xx can handle just about any cartridge you may wish to use.