I am glad you decided to go with the 570 Classified. Its a good card and does have alot of OC potential.
 
2 main things it has over the 480 is:
 
1. - Power management.  At the same clock speeds the 480 uses a good 10-20% more power, depending on the overclock.
 
2. - Its a 400 series card. Nvidia stopped releasing huge graphics performance boost in the driver coding for them. They have mainly been focusing on the 500 series.  Now with the 600 series out, you probably wont see anything but compatibility releases for the 400 series.