Quick- what can i substitute for ctz???

[Radobrewer]

I just realized I don't have Columbus. Below is my hop schedule for my IPA:

1 oz Warrior @ 60
1 oz Columbus @ 15
1 oz Centennial @ 5
2 oz Amarillo @ 0

On hand I have more Centennial, Amarillo, Magnum, Fuggles, Cascade. How about 1 oz Amarillo in place of the Columbus?

 

[Leithoa]

http://www.homebrewstuff.com/hop-profiles says your subs should give similar flavor profiles. Though amounts will have to be adjusted to get the same AAU.
Are you brewing this for a descriminating palate? If it's just for you I'd take this as an opportunity to experiment. Ignore your hop schedule all together, create a new one. Or do as you suggested and let us know how it turns out.

 

[Effingbeer]

Centennial, Amarillo, cascade. All perfect choices to replace Columbus. In fact, I would prefer any of those over CTZ.

 

[Radobrewer]

I went with 1 oz of Amarillo instead of CTZ @ 15. Going to dry hop w/ 2 oz of Amarillo as well. Can't wait to see how it turns out. Will post results. Thanks.