I don't think the fact that you are applying based on marriage has anything to do with not receiving your FP notice yet. It seems that it really has more to do with your SC and your DO. Many people at different SCs applied well after you yet have received their FP notices. In my case, my GC was employment based and although I received the NOA on Nov 21 (my PD at CSC was 8-21-07) I have yet to receive the FP notice. My DO is Santa Ana. I also know of one other individual who applied at CSC (Santa Ana DO) and has received the NOA but still no FP notice. Seems like Santa Ana and Sacremento are very slow while places like LA and San Diego are moving faster.
Will keep you posted on my case, as well as that of the other individual I know, and let you know when anything changes. Eventually, I will start calling to try to get some answers, but not until after the holidays. By then it will be closer to 45 days following receipt of original NOA.
On another note, I checked the Santa Ana website last night and their metrics section still indicates that they are processing N-400s in 7 months (last updated Nov 2007) but then in the text section it notes the standard 16-18 months processing time for N-400s filed after June 1, 2007. The whole thing is very strange, and it is difficult to know what to believe.