Speak Text Huuuuge update
A new update for Speak Text - Hands Free has come down recently that greatly increases speech recognition quality and accuracy. The update also brings the ability to respond to texts totally hands free. This is far superior than any other hands free texting app because the other apps use the built in google speech dialog that requires you to physically touch the screen when it can't recognize what you say, it will prompt you to "Cancel or Try again". Speak Text totally bypasses the dialog and uses a custom interface. Basically the app will read your incoming sms text messages, only when you tell it to read aloud will it do it. Give it a shot.
Trial and paid version available: [Only registered and activated users can see links. Click Here To Register...]