Just do it, i spent near enough a year **** balling about one. In the end i got rid of my VX220 and my Jeep as those combined worked out to be a lot more to run than just a 350z. Massively happy with my choice as the VX in the winter is beyond a horrific joke which led me to use my Jeep which was a 4 litre and did 17mpg driving like a granny. I have to drive a 100 mile round trip to uni three times a week and thats about it.
So for me it was a good compromise my insurance was £700 for a year on the zed which has halved the cost of having two cars on a multicar policy. I was getting about 29mpg on average when i first got it a few weeks back, but after getting used to it im now getting a bit less but still about 25mpg. Which to me is great haha.
Just do it, worst thing that can happen is you dont think its a great idea and you have to sell it and buy something else. At least it will have been fun for the time you had it and you wont regret it imo.
Oh just to add im 23.