Or better yet, claim the proper ammount of deductions on your W2,takeall of that money that you would have been loaning to the Feds intrest free and place it into an intrest bearing savings account and at the year invest even more money than you would be getting back from theFeds byclaiming"0".
You just gotta have the dicipline to put it into a savngs account every pay day.
Or since you, and probably she, knows about this engagement you might want to make sure she gets a nice ring.