Just put a deposit on a sports car. Am I a complete dummy here?

[Scott V.]

I'm totally prepared to get my *** grilled based on the title of this thread but that's fine. Please share your honest opinions. Here is the situation:

- I'm a complete car nut. I spend a lot of my free time researching cars, shopping for cars, watching videos, etc. and I've had my eye on a few models for some time now.

- I'm 30 years old, I'm a dentist, I do not have student loan debt, I live in an area of the country with one of the lowest costs of living, I have a monthly mortgage on my home of $2100. I make approximately $140,000/year and save 40% of my income. The remainder is budgeted for my expenses including mortgage, food, entertainment, etc. 

- My current car is paid for by the company I work for and I have no car payment. I'm going to be keeping this car as my daily driver.

- I put down a refundable deposit on a second "fun" car and the car costs $45,000.I think I negotiated well, the average estimated "value" of the car currently is about $50k. I've done a ton of homework and this particular car is projected to depreciate very minimally and even has the potential to appreciate in value as it may become collectible (I won't be counting on this as most all cars depreciate). The car is a few years old and has already done most of its depreciating but it still has 3 years of factory warranty remaining which minimizes risk to me in terms of repair costs.

- I have about 100k in cash savings but I will not be looking to buy the car in cash (I'll put a chunk of cash on a down payment and finance the rest at approx. 3% interest).

- I'm torn between the idea of total fiscal responsibility and buying something I've always wanted to own at a relatively young age. I'm not dead set on buying it and my deposit is refundable but I'd like to make my final decision in the next few days. 

- I'm currently single with no wife or kids (gonna do all that someday)

- Since this is a real estate investing forum and the topic is bound to come up, no, I do not have real estate investments at this time because I'm waiting to invest in my own business next year. I'll be looking to go about real estate investing in my field of expertise which is dentistry. 

Have any of you with more life experience gone through something similar and would you have done the same thing over again?