im going crazy trying to decide if i should spend $130 more to get the ipad 3g. someone talk me out of it
Tethering drains your battery quite a bit, so if you don't have a way to charge it during the day I would go with 3G
I don't see why you would need 3G on the iPad if you tether from the iPhone.
Not really, bluetooth tethering, which you can officially do now on 4.3 on the iPad actually uses little power.
And OP it comes down if you want GPS or not. With the WiFi there's no true GPS without a 3G chip.