Upgraded Padding

Initially when we made our flooring selection I convinced myself that I wanted to upgrade the carpet padding in the basement and the upper floor (the main floor will have no carpeting) but I'm starting to reconsider.  Perhaps it's not needed?  We didn't upgrade to the fullest padding - we went with the 8lb admiral.  The included is 5lb.  How many of you wonderful blogger pals upgraded your padding?  What were your reasons?  If your build is done, do you regret your decision?
 

I'm beginning to feel so wishwashy!  I'm just trying to squeeze things into the budget or out of it lol.  I'm wondering how many change orders are too many?  Our SR hates me, I just know it!  :(