I just totaled up all of our expenses. I spent more than the $1500 I had budgeted, but that included a tip for the caterer who helped set up and break down the suedah shlitshis, and donations of $180 each to the Lubavitch Jewish Center and Congregation B'nai Israel. Altogether, we spent $2083.32. Not bad.
Again, I had no decorations, other than the balloons a generous congregation member donated. But I truly focused on the service, and found my family didn't need decorations or a theme, other then the one stated in the Torah portion of joining the community, to have a wonderful experience.