Yes, the Burmester Signature monos are better. Much, much better. I have a 218 which I like very much. It has plenty of power and matched with the 808 pre produces a very natural, organic sound that pairs well with my speakers. But it is not in the same league as the 159s, which, by the way, will cost considerably more than 200k.
Just for my preferences, I'd look at changing speakers in your system, but if you think it sounds like a $250k system then you have really accomplished a great deal in system building and I wouldn't change a thing.
My cable lifters are rebar chairs. You can buy a bag of them for about $10 and they will lift your cables just as high as Audioquest.

