i upgraded very recently from Soundsyle Z2 to Partington Super Dreadnaughts and i must say they are so worth the extra outlay. It really made my system come together.
if its any help i got mine from HiFix for £146. no problems and good communication when it was time for courier etc
Also i filled 3/4 with sand in the central column which seems to help - not sure i would add more than that though
Arcam FMJ CD36 - Wadia 170i & V-Dac - Arcam FMJ A32 - Neat Motive 3.
Sennheiser HD595 - Little Dot MK III Headphone Amp.
Partington SuperDreadnaught, Chord Epic Super Twin, Van Den Hul 'D-102 III', Tacima CS929, ClearerAudio Copperline Mains.