Stillpoints Ultra LPI. I've been using one for several years on my Aries 1 and it let me forget about TT weights. I started with the VPI clamp, then got the VPI steel weight and periphery weight. The Stillpoints was a big jump up from there. I use it in conjunction with the VPI periphery weight and an Achromat.
Of course any improvements will have to do with the specifics of your turntable and system. I use a Teres Audio rim drive motor on my Aries so damping or 'draining' motor rumble is probably more of a concern in my case.
Of course any improvements will have to do with the specifics of your turntable and system. I use a Teres Audio rim drive motor on my Aries so damping or 'draining' motor rumble is probably more of a concern in my case.