Thanks LolaLi,
It turns out that just today the mail brought my fingerprint notice!!!
So the dates now are:
N-400 was delivered (TSC) Sept 7, 2007 (9/9/2007)
Received Date: Sept 7, 2007
Priority Date: Sept 7, 2007
Notice (I-797C) Date: December 21, 2007
FP Notice date: Jan 25, 2008...