It depends on what you're looking for in the IBU's as to when you start adding hops. You already know what 2-row tastes like, now you'll get a feel for what Amarillo tastes like, smells like, etc. hop however you want. I don't think you can go wrong.
Carboy 1: Air
Carboy 2: Air
Carboy 3: Air
Better Bottle: Air
Growlers: 1 Gallon of Wild Yeast Culture!
Keg 1: Cream Ale (left tap)
Keg 2: IPA (right tap)
Keg 3: Cider
Keg 4: Air
Bottles: Sauvignon Blanc, Mixed Wine, Syrah, Apple Wine, Triberry Wine, Chianti
In the Works: Kate the Great Clone
Favorite Recipe #1: Kate the Great Clone
Favorite Recipe #2: Crop Chopper PAL
Favorite Recipe #3: Curieux Clone