It all depends on how the email was worded. If the email said "How much will x website/photoshop killer cost?" and the guy said, "I would say about $xxx" then t

It all depends on how the email was worded. If the email said "How much will x website/photoshop killer cost?" and the guy said, "I would say about $xxx" then there is no contract. But if the emails read more like, "How much would you charge for x." and he replies, "oh I would do it for $xxx." and the client says, "OK." This would result in a contract in CA and probably in others. Even without that second exchange of emails a verbal contract is still a contract so you need to be careful of what you agree to do.