I guess it depends on how hoppy you want the beer. Some, like myself, like a pretty hoppy APA with lots of flavor and aroma, while other enjoy a more traditional route. If you want to go the hoppy APA route, my recommendation would be to get all of your IBUs from either your 60 minute addition or first wort addition. Pacific gem would work fine here. Your other option is magnum. Then add a flameout addition (chill to 175-180 and hold) and let it whirlpool for at least 30 minutes (stir every so often). I would use around 3 oz of hops here. Any combination of what you have (Citra, mosaic, cascade, falconers, Nelson, Apollo, pac gem) would work great. Then dry hop around three ounces as well.
I also don't think there's any harm in having a 15 minute addition either. Just adjust your IBU count at 60 minutes to account for it.