@Scott V., congrats to start with as it seems like you have your financials in order.
As for the car, it is obvious that you can afford it, so no question about it. You can buy the car if it really has gotten to the core of you and you definitely have the "itch for it". There is no reason for you to explain to everyone whether it is or it is not a good deal, as long as it satisfies you, your desires and your needs.
A couple of questions for you that you should truly answer to yourself for the future:
1. Is this a one time deal or an obsession? I know of too many people with similar "symptoms" and buying "the dream car" is just the beginning. Will you be disciplined enough to stop at this or are you going to look for the next big thing/better looking car and keep loosing on depreciation?
This is a good question. From time to time I get the urge to buy this or that, but I'm usually pretty good at not pulling the trigger when I recognize it will only hurt me in the long run and is not something I need. The end goal is always financial freedom and I am probably frugal to a fault (as any of my friends or family will attest). The only reason I'm even entertaining the idea of the car is that it's a lifelong passion of mine and the desire never dies.
2. Quick Math - You save 40% (roughly about 56k) a year. Congratulations, that is a lot of money! You spend the other 60% (which is another 95k or so) for living expenses, entertainment, food etc. If you are single, with no debt, and only $2100 of that goes to your mortgage, I would start thinking about whether you can save more. This highly depends on cost of living based on your location, but I would strongly urge you to start saving more, if you can.
I often take this approach when going over my budgets. I do find the exercise a bit frustrating however beacuse I start asking myself "what the hell are you even saving for? You're in the prime of your life physically, have no family obligations, debt, etc. so enjoy certain things while you can". I'd love to hear from some people in their sixties who constantly delayed gratification when they were younger and hear whether it was really worth it or if they would have splurged a little more on certain things when they were younger. I'm legitimately open to any and all opinions on that topic as I'd rather learn from the mistakes of others than make them myself.
3. MOST IMPORTANT QUESTION - where do you see yourself in 2 years from now, 5, 10? (if you can go that far). Do you see yourself as a dentist working for someone else? do you see yourself opening up your clinic? Getting married? Kids? Will the house you have support your growing family? The fact that you are posting in BP, I am assuming you want to get into RE at some point. Honestly, try to draw a road map of your life for the next 5-10 years. Set realistic goals and try to be disciplined and hit them, this way you will have a much better chance at knowing whether buying a 45k car makes sense or not.
In 5-10 years I see myself as an owner of a (hopefully) successful business, my income goal at that time realistically is in the 300-500k range, at age 35 or so I'll probably be looking to start my family, and in terms of real estate I'll be looking to buy the building I practice in as well as any subsequent buildings during expansion of the business.
Props for posting this. And it is not about getting your a** grilled, it is all about what you want out of your life.
Live your dream my friend, but every now and then "wake up" and do a reality check! :)