I bought my 64gig wifi within five minutes of it's introduction. I knew I wanted 3G but simply could not/would not wait for it.
Now I have to say that wifi only has not been an issue for me as wifi seems to be just about everywhere I go. That said, I pine for a 3G and wish in a way that I had held out for the 3G launch!
For those of you buying now I'd say without hesitation go for the 3G. Small price to pay for insurance of access.
Still trying to figure out why apple staged the introduction of the two. For sure I would have bought the 64g 3G the first day if it had been available.
But, would I have been happier waiting? Hell no! And I love my iPad just the same!
Oh and the more disk space the better, I say!.