i voted 15. they look awesome on your car, classic muscle with a race feel.
not that i don't like bigger wheels on muscle cars, in fact i'm planning on 18s for mine (in black).
here's an idea, if you like the look of the torque thrusts but prefer the performance of the foose wheels,
you could get the 17s painted like the 15s. powder coated centers and brushed rims. here's a rough chop for ya, and one with white letter tires
cheers,
aaron