I contacted Kevin (KAB) last year to ask about his mods and their potential. He told me to keep the SP-10 because the best he can achieve with the 1200 series won't quite reach that level. Bigger, better motor, etc.
I already had the SP-10 so the debate does not apply to me but I can see where the KAB mods might be a better deal considering you can get one with zero miles on it whereas, if you found an SP-10 brand new, it would cost a fortune and a half.
Also, you can move up incrementally with KAB instead of having to plunk it all down at once on an SP-10. In my experience it is more fun to get your improvements in small doses.
Bottom line, in my opinion, is that you can get way more bang for your bucks with a high end, vintage, Japanese direct drive than any modern table can deliver.
Check out yard sales. You may very well get lucky and buy a very serious DD table for $15. If it is heavy, holds speed, and appears to be complete, buy it.