Had Kumho Ecsta Supra 712's on my Turbo Eclipse and a relative of mine had them on his late model Toyota Supra Turbo (Heavily modded). They wear out faster than grandpa on a hot 18 year old blond. But then again, I don't know if you driving your R/T is as abusive as me driving my Eclipse. I agree that they provide excellent grip, both wet and dry, especially for the money. BUT, if you plan on using them year round, forget it. They don't provide any kind of traction at all in the snow.
I went with Yokohama's on my Intrepid this last time. They provide better grip all around than the Eagle GT II's I replaced with them. With an 80,000 mile treadlife warranty and a damn good price tag, it makes it a great deal. Plus, Yokohamas usually have a 30-day ride guarantee, that if you don't like them, you can return them.