If I was going to get a GTR it would be by Ultima
That is a much nicer car that anybody could easily maintain. Really any turbine type engine would suck in a car after 100k miles on it. If you want insane speed go with a hydrogen peroxide rocket and a small engine for normal driving. That way you have sub 1 second 0-60 and 50mpg. My kit car was very close to getting a hydrogen peroxide rocket at one point in the past....
I used to care about only power, but now I want a car that does what it does well and is able to last for 100k without serious work to keep it going. Most supercars don't interest me since they fail at even being possible to get half that kind of life even with lots of work.