Strictly for texting, should I buy Verzion Blitz or Verizon Envy Touch? Please explain your choice.?

I'm signing up for the new verizon messaging only plan which includes unlimited texting, pic messaging, vid messaging and internet. Since this phone will be used for messaging only my main concern is a nice qwerty keyboard... but I also would like to avoid having a phone that is overkill. Anyway I'm stuck between the verizon Blitz which I like because of it's size and simplicity and the Envy Touch just because of it's overall coolness and larger keyboard. Which one should I get?