Hop schedule yields around 50 IBU as per beersmith with the AA's I have for those hops and 10# 2-row. That makes it a quite hoppy pale ale or modest IPA. I made a Vienna/NB SMaSH once and it was quite tasty, NB is a versatile hop and Amarillo/Cascade make a good combo. I'd bet this would also be good with Magnum with the bittering hop.
If nothing else, drop your 15min Amarillo down to 10min. Longer boil time equals higher IBUs. I have a wonderful pale ale that is at 45 IBUs. Strong hops up front but then fades into the malts. I love it.