I'd really love to see a spreadsheet with all this calculations. (Or better, an online html5 virtual rocket calculator tm.) With some default data (usual payload weight, fuel price, orbit speed, ...) and you can choose how many stages and haw much fuel each stage has and the spreadsheet calculate the total price of the mission.

You have a lot of information, but I understand that putting all of this in a xls would be a lot of work.