Difference between IPhone 4 and the 4s?

Ok so I'm about to go buy an iPhone and I want to get the 4 because its 100$ cheaper than the 4s. Is the price difference worth it? Like could my carrier (which will be verizon) eventually stop supporting the 4 or something? And what are the major differences?

There are some big differences.
The camera in iPhone 4 is 5 megapixel while iPhone 4s has 8 megapixel camera.

iPhone 4 records 720p HD videos wihle iPhone 4s records full HD 1080p videos.

iPhone 4 has a lower single core processor while iPhone 4s has higher dual core processor.

You can play games on better graphics on iPhone 4s than iPhone 4.

iPhone 4 does not have Siri while iPhone 4s has Siri.

Here is a in depth comparison http://www.everymac.com/systems/apple/iphone/iphone-faq/differences-between-iphone-4s-iphone-4.html

The only difference is Siri. The only reason why the 4S has an "S" in it is because it stands for Siri. But, I don't think they sell the 4 anymore and the 4S is only a dollar but, I guess it depends on where you live.

On a new contract 4S is free, so why not go that route?