I tried the 300ZX and thought it was absolutely appauling. Same with the 3000GT, it was one from '98, something like 3000GT Vr-4, don't remember exactly.
And George Morley, I'll be really interested to see how your times are this week. I'm assuming that you're using the NSX. I had a Type S Zero, I liked it a lot, but felt like I'd need to push it way beyond my own limits to be competitive.
But as of now, I'm using the Cebrera Speed Six, which is around 550-585hp depending on how long it's been since an oil change.