Need advice...Buying 2006 roush F-150

[fresnoroush]

Fellas.

Need some advice on the the Roush package. Already have the X-plan on the truck, so the only haggling is on the Roush package. Price for the Roush package on the vehicle is about $12K. Who knows how much the dealer might come down? How much markup is in this package? they have already said they will come down $2K. I want to make a reasonable offer, so I ask the advice of the knowledgable folks here. Look forward to becoming a regular poster here!

Note: This is a 2006 and they are a bit motivated to move it. However, they also say I am already getting a deal by them extending the X-plan to this "specialty", "collector" Roush vehicle.

Thanks in advance.