I like IPAs for sure, but I haven't had a Racer 5. I ordered one once at a bar (the Mason?) and the keg had just run out so I was out of luck. Since then it's seemed like a forbidden fruit or something. I really haven't gone out of my way to look for it though.
While IPA is probably my favorite style of beer and the type that I drink most, I don't experience much variation in enjoyment going from one brand/brew to another. I'll compare a Stone, Red Hook, Lakefront, or Goose Island IPA (among others) and enjoy all of them about the same. I think that the double or imperial varieties are a bit too sweet, I prefer mine to be dry. I used to really enjoy New Glarus' IPA, Hop Hearty(?), when it was available, but it seemed distinct to me, different from the standard IPA taste, maybe more malty. I liked it better than the black IPA they are selling now. Karben 4 has that black IPA that seems to be a good seller - Silk Scorpion. I thought it was interesting but not worth going out there again.
I like Hopalicious very much. While it's not labeled as an IPA, it's a fine stand-in in most circumstances.