I also don't disagree with your point that buying used will likely mean you're turning over your cars more often, so that is also part of the calculus. Although behaviorally, that actually may not be true since Americans seem to have the stereotype of loving them some new cars and don't hold on to them nearly as long as they should (I have no research to back this up).
Even if you're comparing a new car purchase, both with cash and a loan, that loan may make you feel a whole lot more comfortable with all add-ons you can splurge on, or the trim level that is $10k higher.
Sorry for the car detour, I just was surprised no one picked at the car loan tidbit in the OP.
Sounds like OP is in a great situation regardless.
My only other advice is to keep a regular budget and be on the same page with your wife.
Even if you're comparing a new car purchase, both with cash and a loan, that loan may make you feel a whole lot more comfortable with all add-ons you can splurge on, or the trim level that is $10k higher.
Sorry for the car detour, I just was surprised no one picked at the car loan tidbit in the OP.
Sounds like OP is in a great situation regardless.
My only other advice is to keep a regular budget and be on the same page with your wife.