Drywall time

I have figured out how much drywall I will need, I believe, hoping it is correct. Plan to go get about 50 sheets of 1/2 inch drywall in a few weeks. I can then button up the office and bathroom pretty quickly. After I get the walls covered I will be happy, since the basement will be taking shape. I will probably get one more load of drywall for the ceiling (3/4 inch) and if I need more 1/2 inch I will get it at that time also. I still have a few little things to do like building the sofet around a few ducts and around the metal I-beams in the middle of two rooms. I think i am going to put mdf around the two I-beams though. Now that I have the table saw that should be very easy.