I agree with Howard, it depends on how full you want your tank to look. I prefer not to overcrowd my 65 gallon but I'm now addicted to TBS rock. I was ready to buy more but Richard and my better sense says to let the rock and sand percolate for 6 months or so and make a decision at that point at add more Live Rock. I'm completely new to SW so if I accidentally make a mistake, it's not too much money invested. Currently ordered just a little over 1/2 what my tank really requires.
