Honestly...
Im going to go 3.8 v6 camaro on this one, by far..
You can get it cheap, the motor's super solid and has great power compared to some in that list (low 15s stock with 5spd iirc), the car is fairly easy to work on, the drivetrain and suspension bits are pretty sturdy, used aftermarket parts are plentiful and cheap, and it wont completely crumple up when you toss it into a wall.
Id also like to add that people talking about SVO mustangs should get serious about the practicality of that for $2k and realize that you can turbo an 85hp 2.3 mustang with factory parts from more plentiful thunderbird turbo coupes and bolt on cheap, plentiful suspension bits to get the same result for less money and no risk of trashing a rare car.
Also, a sohc 3.0 3k gt stripped to the bone is a perfectly fun, decently reliable automobile.. and comparing a 3000gt to a 3rd gen f-body is just nuts to me. One feels like a rolling tool shed with all the tools falling off their pegs, and the other one is a perfectly decent car whose biggest failing is being the same weight as the camaro and having a crowded engine bay (UNLESS its sohc.. those are roomy!).