Flip tells me I should clarify the window debacle; I'm not totally a dork, just partially. When budgeting the windows: a) make sure you have final window specs (e.g., number and size of windows), b) make sure you understand that working with SIPs means a fatter exterior wall, which will entail extending the jambs, and c) include the exterior doors in your budget. "c" is where I fell down on the job, the other two were just learning curve issues. So yes, I'm occasionally brain dead, and no, not always and completely.
FYI, things you also want to remember when budgeting windows: screens for all of them, any funky hardware you are choosing that is not stock, and lastly, if any of them are right next to each other, in which case you want to order them milled in pairs or triples to ease installation.