Hi all, I am interested in buying my 1st digital camera. After a lot of research I am down to 2: - Pentax Optio S - Casio Exilim EX-Z3 I am not sure which one to choose. I like the Pentax camera because of its size and I like the Casio camera because of its big screen. Which one do you think I should pick? The price is similar to both. Many thanks.