Mid-life...at 25? I could see it at 35 or 40; but everyone is different. I'd learn to control your Wants over your Needs. Use the $ to get a cheap daily driver, and pay down your Z. Learn to enjoy the car for what it is. If you bought it for straight line drag racing, you bought the wrong car. Its respectable, but this car was meant for carving up the curves. Just my opinion, but it sounds like you're upside down on the value of the Z. In the future, consider looking at the Total Cost of Ownership over, say 5 years. That will give you a good idea of how much the car will cost to maintain and what it will be worth in a few years. Just speaking from experience after having been in your shoes years ago. After having a daily driver though, I ditched it because I ended up just driving my hot rod once in a while and never really learned to enjoy it's full potential.
Now, if I had a GTR or something crazy like that, I'd keep a DD. However, this is why I bought the Z over the Porsche. I'm gonna enjoy it and not feel guilty about it. The difference between a $35k car and a $100k car. Again, just my input.
Also here is a little lesson my father taught me a few years ago. "If you got to worry about the costs to maintain it, you can't afford it." - This coming from a man bought his wife a DB9 for her retirement and himself a RR Phantom to drive back and forth to work in. (and no, money doesn't roll down hill in my family)
..and in case you think I'm full of ***T here I am in my dads garage with his RR Phantom...
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Its good advice and I've learned to live by it...keeps me from getting into that same old situation of letting my WANTS get me into trouble.