Threaded footers for my DIY audio rack

I am building a 3 tier rack that will have shelves 2" thick, 46" long and 18" deep.  The uprights will be 2" thick, 5" wide and 32" tall, two on either end of the rack.  The rack itself will be approx. 200 lbs.  Total weight with equipment will be approx. 375 lbs.  
  I am looking for suggestions as what threaded footer I should be considering for best performance.