This sounds like 2 separate questions...
1) What is the most popular configuration?
and
2) Which configuration is right for you and we do not have enough information to answer that.
I think it's an interesting question. I'll add a poll, so we can see what it might be.
I have the 64G 3G version...I cannot imagine spending the money for the iPad and not going with 3G capability. Most airports charge for wifi, and for traveling by auto the 3G is indispensable. Spend the extra $130...it is only money, but if you don't, at some point you will probably wish you had not gone the cheap route. I love this tool when traveling.
much more if you use it recklessly.
This makes the *total* cost of 3G much more than the extra $130 as indicated above.
What I meant by "use it recklessly" was to be unaware of your usage and go way over your cap, which will end up costing you a lot of $.
For example, I've spoken with people who swear up and down that running internet radio stations off 3G nearly 24/7 should not use up their 2GB ... oh dear ... same for YouTube addicts ... they just don't seem to get it sometimes.
What I meant by "use it recklessly" was to be unaware of your usage and go way over your cap, which will end up costing you a lot of $.
For example, I've spoken with people who swear up and down that running internet radio stations off 3G nearly 24/7 should not use up their 2GB ... oh dear ... same for YouTube addicts ... they just don't seem to get it sometimes.