I'm very partial to American IPA's. Definitely my favorite style. It's easier to find American IPA's than English IPA's, but they are both available. Click below for the actual BJCP guidelines:
http://www.bjcp.org/styles04/Category14.html#style14B
Commercial examples from the above site are:
American IPA: Stone IPA, Victory Hop Devil, Anderson Valley Hop Ottin', Anchor Liberty Ale, Sierra Nevada Celebration Ale, Three Floyds Alpha King, Harpoon IPA, Bell's Two-Hearted Ale, Avery IPA, Founder's Centennial IPA, Mendocino White Hawk Select IPA.
Of these, the Bell's Two Hearted Ale is my favorite. Since they brew it in neighboring Michigan, you should be able to get in Wisconsin. The Stone is good also, but I think the Bell's is the best of the bunch. Of course Avery is excellent as well.
English IPA: Freeminer Trafalgar IPA, Hampshire Pride of Romsey IPA, Burton Bridge Empire IPA, Samuel Smith's India Ale, Fuller's IPA, King & Barnes IPA, Brooklyn East India Pale Ale, Shipyard Fuggles IPA, Goose Island IPA
I'd like to add to this list Sierra Nevada IPA. It is brand new for 2006 and not available everywhere, but it is quite good and definitely of the English IPA variety. As you can see, the Goose Island you bought is an English IPA example.
When brewing the IPA styles, the quality of your hops is going to be EXTREMELY important because they are heavily featured in both sub-categories. I found this out the hard way. Do not take short cuts with hop quality. It's worth the extra buck or two to get quality hops. This does not mean you have to use whole hops. I use pellets exclusively. After experimenting with several vendors, Williams Brewing is the best source for pellet hops that I've found.
Good luck with your recipe!
Prosit!