There's nothing wrong with buying nice things and having good experiences with your wife. The whole point of financial independence is to be able to spend time (and money) on what's really important to you.
126k is gross income? So roughly 88k (30% total taxes) net income?
Looks like your total spending (including mortgage, debt, etc) is ~77k (6,448 x 12), so saving ~11k? You're at a 14% savings rate. Not horrible, but that's not getting you to financial freedom any time soon...
Others already provided good savings advice on some items, so I'll just add that you should step back and look at your overall goal. Perhaps set a target of 20% savings/investments (as % of gross income) by next June? Then make sure wife can agree to that, and start moving in that direction.
Since it seems you two are spenders, the best way is to take the money out before it feels available (e.g. maximize 401k, IRA contributions and also set up auto drafts into a brokerage account and autoinvest into some ETFs). It's easy to spend money when there's cash available.
Given you're at a solid income level, and studying for PMP, I assume you expect to be in management in the next 5 years and probably also expect some pay raises. One way to help the spending is to freeze the spending in absolute terms. Say, you want to keep spending at 70k/yr (current levels), and not increase as your pay increases.
So to summarize, a few ideas:
- Set goals jointly with your wife that feel reasonable
- Set up auto-investments to prevent temptation to overspend
- freeze spending at current levels, and don't let your lifestyle inflate with your income
... watch your assets grow! :)