Eh, I've been in enough rediculous cars in the past to know what I want for my own car. 800rwhp gte sc300, 1100rwhp turbo c5, 500rwhp sr20-240, and even a 343rwhp turbo miata. Frankly, the issue isn't whether I /can/ drive it on the street or not, or if it's even difficult to get around. I know what fast is. Frankly when I set out on my supra project, I decided early on that what I wanted was a mid 12's car. Why? Because when it's done right, mid 12's spanks most everything on the street anyway, and is a pleasure to drive around.
If I wanted a track car, I'd have build another rx-7. If I wanted something to post crazy dyno numbers, I'd have gone 2j. I wanted something that was fun to drive and work on. I got that, and it didn't even cost me an arm and a leg.
PS: I'm not a cheap mkIII owner. I've got more parts and ambition than time, and don't mind spending the money when it's the right thing to do. I also don't mind fabricating things when I want something, and either don't like the price or don't like what's available.
Frankly, 450rwhp is a fast car. It will beat 98% of what's out there. If you want to compete with that last 2%, be my guest. Been there, done that, done with that.