I'd have to test it out, but there is the 93' Civic Si in the game that is a very quick car when fully modded. Assuming the same hp, the Civic should have the nod over FD's or FC's of similar horsepower, given its much lighter weight. The 83' RX7 with similar hp, should have the legs on the Civic, though admittedly, I haven't tested that theory.
I didn't know you could get the Vector in the Greatest hits version, as it had been widely reported not to happen. I have both the original and Greatest Hits. I tried the Trial Mountain a few times with the Greatest Hits, and have yet to see the Vector. I wonder if there are different versions of the Greatest Hits?
On your version of the Greatest Hits, what does the R body for the Ford Taurus look like?