the SOTA COSMOS is slightly over your limit. nevertheless I belive it is an all out design which uses mass, floating suspension and vaccumm hold down. you need (don't want the suspension to oscillate)to use a light weigt arm and cartridge. I beleive you cannot use mass alone to damp out structual and airborne vibrations. an appropriate arm would be sme iv.vi and sumiko celebration.
Good news is there is an embarrasment of riches at this price point.
Good news is there is an embarrasment of riches at this price point.