Is there a big difference between the iPhone 4 and 4S?

So I'm getting a new phone! The iPhone 4S is $80 cheaper than the 4S (which is what I want) which would be more economic… So basically, besides Siri, is there really and 4S advantage over 4? I just don't really have the money for 4S right now, even though it's what I want:/

I don't think there's a big difference hope that helped and I want to get and I phone 4 also.

Siri, a lil faster, lil better camera thats is.
you can always jailbreak and add siri to any iphone 3gs or 4