As someone who is adverse to debt, I believe it's my obligation to warn folks about what debt can do if it goes unchecked.
Debt can destroy lives. One of the prime contributors to my divorce was debt. I was debt free before I married, and now two years after it was final and 3.5 years since the seperation began I am once again debt free, save for a mortgage and a modest loan on the Scion tC.
That's after having $70K of non-mortgage debt. That's right, I paid off over 2/3 of that debt WHILE going through the divorce. I had to re-fi the home to give my ex her share of the home equity, and did put the remainder of that into the loan. However, I've not run the debt back up in the two years since the re-fi.
But the stress that the debt (mostly caused by her spending, but I have to own my enabling behavior) did not bring out the best in me. I was frustrated, tense, angry, and not a fun person to be with.
She had a much better way to deal with it, ignore it and go shopping.
I'm not going to say that debt is all bad or it's all good. What I will say is that you both have to come to an enthusiastic agreement regarding how you are going to use the tool called debt.
Because if you cannot agree, and I firmly believe there should be mutual and enthusiastic agreement before you use debt, and agreed upon spending plan. Not micromanagement, but boundaries that you both agree to follow.
Because if not, it can tear your life apart.
Personally, I choose to avoid most debt, or use it as a tool when it's to my advantage. I try to use cash rewards credit cards, and pay my balances in full. I was able to do a lot of my Christmas shopping on cash rewards this past year.
I bought my generator set on Sams Club's Discovers 6 months no pay, no interest. I keep the money earning interest for me, and pay 1/5t of the balance every month. (Actually, I'm getting about 7-8 months because they made a mistake and when I called them on it, they started the 6 month clock as of the date of correction. It will be paid off in 4 months, or tomorrow if I wanted to write the check.)
Anyway, not to make this about me, or that I'm the all knowing... I'm not. But I can provide my experience as a warning to those who think they can just have individual finances, and each do their own thing. It can go horribly wrong.
Do what it takes to come to a mutually agreeable way to handle money and revisit this 2-4 times / year to see if you are reaching your goals.
That's the last thing. Don't call it a budget, that sounds so restrictive. As Dave Ramsey and the folks at Crown call it, it's a plan. Money is a tool. Call it a money map, a spending plan, whatever.
Ok, I'll get off my soap box. I do hope you and your fiancee enjoy the car. My last bit of unsolicited advice is to spend much more time planning the marriage compared to planning the wedding. The wedding is one day, marriage is supposed to be for the rest of your life.
Oilbabe and I are taking a 10 week course in her church in preparation for marriage. She doesn't have a ring yet. You know why? I'm still saving the cash to get her one