I personally dont agree with the suspension beltdrive unstable pitch story of lewm.
I would not go for a unipivot arm , but with a more rigid arm construction with bearings on eather side , for example sme v or da vinci for example(beautiful) .
And than take a good stable record drive mechanism.
There are many choices and the better/quiter the drive the more neutral the sound will be ,Tw acoustic also is nice , i think basis would also be a nice choice and not to expensive .
And to get good things cheaper , go for good secondhand maybe.
Good luck your system definitively needs a great TT set up , wonderfull system by the way.
I also saw a secondhand rockport sirius 2 for sale on the net for a little bit over 10000 euros , always nice to get a classic in .