This has likely been discussed, but I bought my iPad at Target - not online. I did so because of their return policy. I got the 64 gb wifi originally. After a couple weeks I took it back, paid the difference and got the 3G version. No questions asked. Painless.
I was told that their 3 month return policy also holds for the iPads. So, if I run into an issue, I can take it back within the 90 day period. BestBuy is good for 30 days.
Worth keeping Target in mind for such purchases.