IPad would be my choice. My kids have different stuff, and I have used several. but the IPad has great free apps, great pay apps, easy connectivity, good size. I want the 32 gig wireless version. I would not buy the 4g model, as you have to have a data plan. But the wireless will allow you to connect wherever you have wireless access.
I am with you, WiFi only. Hell, its getting hard to find a place that does not have WiFi. I use Zinio for most magazines. That way I can be away from WiFi and have lots to read. Same with books, movies. My first was 64 Gig. Never got near filling it, so went with 32Gig. Best advise, don't go cheap on the case. I had an Otterbox I loved, but now have it in a Griffin defender.