I need your help! Do you know a good wifi phone?

I'm thinking of replacing my old phone with a new one. Since it has been with me for over a year, I think it's about time for it to retire. The only problem that I have right now is I don't know what to buy... I'm okay with any phone model, as long is it's wifi ready. I went to the mall yesterday just to get an idea. I don't want to sound stupid but I really need help... :(

Here's a cellphone model that I've been keeping an eye on since last week:


Photo courtesy of Doc Tony Photography