My wife and I have a mutually agreed budget.
It includes everything, down to the penny.
We're not always exactly on budget every month; we'll slightly overspend on one category this month, then save a couple bucks next month, but over a few months we do average what our budget says we're supposed to be spending in each category.
Microsoft Money is a great program to help you keep track of this stuff, by the way.
Every kind of expenditure, including savings/investment, charitable giving, all household expenses, all the bills, debt reduction (we're paying off our house at an accellerated rate) -- it's all in the budget. The budget reflects our mutally agreed priorities.
We have had some disagreements about these things in the past, but all the disagreements have been settled to somewhere we can both live with.
Right now, we each have $50 per month in the budget to spend on our hobbies.
We also have a standing rule that neither one of us will purchase anything exceeding $100 without mutual discussion (unless it is an already agreed budget item).
I read your other thread. It doesn't sound like you two have a financial plan. A marriage without a mutually agreed financial plan is in big trouble.
If you think that marriage is cutting into your gun budget, you don't want to think about a divorce: it's much more expensive.
In the end, your marriage and your family are going to be a lot more meaningful to you than having more guns. Rethink your priorities and, as has been advised, get some professional help.
Suggestion: re-do this poll, eliciting responses only from married folks with children. I used to spend stupid crazy money on guns before I was married and had kids. Life is a lot more complex now, with a lot more priorities to balance.