Cheapest carrier for iPhone4?

Since the iPhone4S is coming out, the iPhone4S is at a really good price right now and I was wondering what carrier would be best? All I want is unlimited texting and caller ID but I know with any iPhone, you need a data plan if it's not prepaid.

Some carriers have the iPhone4 at $0 with $55 on a monthly plan, some have it for $50 with $50 monthly but what would be the best carrier quality wise and for price?

Added (1). Typo- the iPhone4 is at a really good price right now* not iPhone4S

You can check iphone plan comparison here: http://www.google.com/...RwZ1OpV32g

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