Adul,
You could do the wedding for 4K if your guest list consists of only the two required witnesses, and she orders her dress from KMart.
The catering alone, for a reasonable sized guest list, will eat up half or better of that 4K. A decent dress will start between $800 and $1000, not to mention a couple hundred a crack for the Bridemaids. Photographer (a good one) won't be less then a grand.
We haven't even gotten to flowers, table decorations and setup, room rental, tuxedo's, limousine, minister fee, cake (that's several hundred right there), entertainment, etc., etc.
While most of we men really couldn't care less about all this crap, this is, for most women, the second most important event in their lives. It is not a time to be a tightwad.
EDIT: BTW, if this is her first wedding, her parents are supposed to pay for it.
Russ, NCNE