First off, listen to bobbrews; he knows his IPAs. Second, I'd move your hops around. Here's the schedule I'd do with those hops:
0.5 oz Nugget (15.3%) First Wort Hops (FWH)
0.72 oz Northern Brewer (10.3%) 30 min
0.5 oz Willamette (5.5%) 30 min
1 oz Cascade (7.1%) 10 min
0.44 oz Crystal (4.1 %) 5 min
1 oz Cascade (7.1%) 1 min
As Bob said, 45 minute additions do little. You don't get the aroma and flavor that you would with later additions, but you also don't get all the bittering that a 60 minute addition would give you. Good luck and cheers!