Here is a combo I use and like:
Nugget at 60 minutes
Cascade/Centennial at 15 minutes (use either hops or a 50/50 mix)
Cascade/Centennial at 5-0 minutes (use either hops or a 50/50 mix)
Saaz Dry hop
The Cascade and Centennial give it a citrus flavor while the Saaz tops it off with a pleasant...