Just buy a low mileage 1994 NSX Coupe , add the Zanardi or NSX type R suspension ($1500 to $2900) and the 1997+ brake calipers and rotors (less than $1,000 used); AND SAVE YOURSELF A BUNDLE. You will have the lighter weight, fixed roof (coupe) and the manual steering.
That's what I have done. With the savings, you can add the Comptech headers ($1300 @ NOPI) and gain 12 horsepower (to 282 HP) - or add whatever your heart desires!