i had a 16gb wifi only ipad 1 (stolen :-| ) My opinion is that the ipad is not the same without 3g. Feels like leashed to wifi. Can't use in peoples house, 90% of kopitiams and restaurants, cafeteria at work, lining up or waiting for number, in the car ... etc etc. I believe its a "cloud device", meant to live on the internet, always available connection to fully use to max potential.

edit:reply to kevintai

I agree it requires an extra step. However, I used all my communication on my phone. IPad is for me to read books, online at places that I'm gonna spent for hours and play games. It's not that price of the iPad that bothers me. It's the monthly data charges. A penny saved is a penny earned