how to have a quiet set up? foam under sump?

[smokinreefer]

hey all,

I've finally decided to get some friends to carry my new 65G tank/stand/sump up to my living room so I can start to transfer my old 25G over.

the tank is in the living room and even the noise from my current all-in-one tank (noise from overflow) drives me nuts. so needless to say even though the new tank is bigger and will have more and larger equipment, I need it to be as silent as possible.

first off, the stand is a prefab standard pine stand with 2 doors. the bottom of the stand is raised off the floor.

so with my sump being inside the cabinet will I need to put some sort of padding underneath the sump? will it help with possible vibration/noise from the return pump, skimmer, etc?

what else can I do to keep noise down?
I will be using a herbie overflow with a gate valve, I've read these to be reliable and quiet.

my returns will be plumbed over the top of the tank. but a bit worried with this. wont the pvc plumbing make noise/vibration since its just resting on the tank itself?

thanks for your input!