i'm sure you're stuck on the IPA recipe idea. but that is really a style that, as others have mentioned, you don't necessarily want some crazy yeast. a little yeast character isn't bad, but you don't want anything you get from the yeast to overpower the hops. so especially if you're new to this, i would highly suggest to not go crazy. the good thing is that you are doing 1 gallon batches. that's definitely the size you want to experiment with! it's not very fun to have an entire 5 gallons of something you don't particularly enjoy.
all that said, i'm also for being a bit crazy and not necessarily sticking to the style guidelines. but i would say to go ahead and stick to those guidelines until you're consistently producing good beer with proven recipes (and unfortunately a couple of good ones in a row doesn't necessarily qualify a person as a good brewer). what i would personally do, again going off of the assumption that you're fairly new to the game (because it's in the beginners section) is try the different west coast ale yeasts and see which one you like best. some of the yeast strains are purportedly the same, but the will still create slightly different beers. maybe as the one commenter suggested to only get crazy with one of the five.