man the sonic stock heatsink looks hurting
Musashi seems to be one of the better coolers for the boltspace of the palit cards that fits.

If your useing the palit platium card i would not bang your head over it too much.Just remove 4 screws to take off fan and shroud,then just mount a 120 fan of your choise.
with a paste change and fan it was quite and 4-5c cooler,plus the vmr area has more air over them to help keep them cool even if you dont put sinks on them.