The American IPA I have cooking now includes Amarillo, Centennial, Simcoe, and Columbus hops, the same combo in the DIPA Pliny the Elder, but with about 25% less hops per 5 gallons.
For the current IPA, I used:
1 oz Simcoe, 20 min before end of Mash
1 oz Amarillo, 60 min boil
1 oz Centennial, 1 oz Columbus, 15 min boil
2 oz Centennial, 2 oz Columbus at FO
2 oz Amarillo, dry hop for 7 days
The "young", unconditioned beer 2 weeks into secondary has a pleasant fruit and spice aroma, and a dry, pleasant bitterness. I expect this to be bottled this weekend and conditioned another 2 weeks. The grain bill is over-simplified for this brew: 96% 2-row pale malt and 4% Crystal 60L.