WiFi + 3G
I had the WIFI only, then decided I couldn't leave home without it!
Upgraded to the WIFI + 3G!
MacBook Air (new - late 2010)
AppleTV (new and old)
iPad 32GB 3G
For myself, having an iPhone that gives me internet/etc via 3G, it did not make sense to pay the extra $$$ (up front + recurring data plan charges) to get 3G on the iPad.
I basically use my iPhone as (1) a mobile phone and (2) a mini/pocket iPad. My internet use on the iPhone, for the most part, involves navigational help/Google Maps, quick Twitter/FB/FourSquare updates, short emails, and quick "who wrote that song" type of Wikipedia searches.
Longer internet sessions (reading the news, checking RSS feeds, catching up on Twitter/FB) are things I do at home, where I have wifi. I do travel on business, but now that many/most decent hotels have wifi, I can usually jump on wifi even while travelling just as I do at home—in the evenings, at the end of the day.
If you don't have an internet-capable mobile phone, then maybe the iPad 3G makes more sense.
iPhone 3G 8GB (black) / iPad 16GB wifi / Apple folio case => tucked into a Timbuk2 Freestyle Messenger
~Follow me on Twitter: @iDharma~
Wifi.....Unless you live in a highly populated area/ big city than AT&T's coverage will not be good. If it was Verizon then that would be another story.
I got the wifi only one, AT&T doesn't have good coverage here so there was no point in paying the extra money for something I can't use.
just go for the 3g + wifi , you will never regret..trust me..
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Get the wifi - 3G man I just got mine today and I'll tell ya bra you won't be dissapointed
My ipad wifi only, 32 gb, is really all I need. there's always a wifi connection at some hotel.