I have the 08 Stage 3. the 427 has the same power package.
I wouldn't set Jen out in the car.... It'll get away from you if you're not very careful... Its a serious machine. They are 12.5 sec cars in stick form. It'll need tires every 10,000 miles.
I paid 49k for mine. The 427 is two models under, and if I remember correctly they were going for 44k last dec when I bought my car.
FYI the OSO of Roush cars is www.fnsweet.com
don't go there or you'll get hooked.
There is a classified section on there and some of the cars are cheap.