My favorite late/dry hop combo right now is Columbus + citrus hop + noble-type hop (usually Columbus/Amarillo/Ultra). Here's what I'd do:
60 min - 20 IBU's bittering hops
15 min - 15 IBU's Simcoe
0 min - The rest of the Simcoe, 1oz Cascade, 1oz Mt Hood
Dry Hop - All your remaining Columbus, Cascade, Centennial and Mt Hood