what models of ipad have ios7 or 8

The iPad 2 and newer can be updated to iOS 8; all of these have enough space to hold it.

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The original iPad Air came with iOS 7. The oldest iPad you could get would be the iPad 2, as it and later models can update to iOS 8.

Here are several links that might be of help in your search ...

Identifying iPad Models

http://support.apple.com/kb/ht5452

iPad Tech Specs

http://support.apple.com/specs/#ipad

iOS Devices and Specs

http://en.wikipedia.org/wiki/List_of_iOS_devices

Mac, iPad, iPhone and iPod Lookup for Specs

http://www.everymac.com/ultimate-mac-lookup/

Any iPad except for the first generation iPad can be updated to iOS 8 . That is, iPad 2, 3 ,4, air and Air 2. Mini, Mini 2 and Mini 3. for ease of identification, any iPad with a camera can currently support iOS 8 .

If you purchase a used one, that already has iOS 7 or greater installed make sure the previous owner has released it from their Apple Id, otherwise you will not be able to use it at all as it will be Activation Locked.

What is Find My iPhone Activation Lock - Apple Support

Check Activation lock status of a device

As to Storage space, (memory is not subject to change), I would get as much as you can afford. Its better to have more and not need it, that find out you don't have enough. I would not consider anything under 32GB.

Every iPad from iPad 2 can be upgraded to IOS 8. The basic 16GB model Will suffice. Can Icrecommend at least a iPad 4. The 2 and 3 are rapidly showing their age.

You can get an iPad, 4th Generation for a good price and also get the full two years of AppleCare (you have to choose this) ... and be not too new and not too old ... :-) ...

http://store.apple.com/us/browse/home/specialdeals/ipad/ipad4gen

If you get the model with cellular, you don't have to activate the cellular and it will have extra features on it that the WiFi alone doesn't have, like GPS.

And then, if you just wanted to use cellular for only one month, you can do it right on your iPad in a matter of minutes and never have to talk to anyone on the phone. And you can stop it, even if you've only used it for one month (you don't even have to use it at all). It's just that simple.

1. The iPad air and iPad mini 2 were the first iPads to ship with iOS 7.

2. See #4.

3. 5.1 and 6.

4. Yes.

5. Click here.

6. If they've removed it from Find my iPhone.

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Answers in bold.

tangerine3 wrote:

So let's see if I have these right?

Ipad Air is the 1st Ipad to come out with IOS 7 installed

That and the iPad Mini 2. Came preloaded with iOS 7

If I do buy any Ipad below that e.g., 4th or 3rd gen it will have a previous version of ios?

Maybe, maybe not. It may have been updated to a current version or not. Depends on the original owner really. But you can Ask directly. If it was not updated, you can update it yourself.

What IOS version was preinstalled on 4th and 3rd?

3rd had 5.1 4th had 6.0

Or maybe if i find a 3 or 4 the previous user could have installed ios 7 or 8 already?

Yes. Very likely. And even if they did not you can update yourself.

How hard is it to upgrade to IOS 7 or 8 are there any glitches along the way more than one generation to the next? e.g., harder to upgrade a gen 3 than a gen 4?

There should be no issues updating. unless you get an iPad 2 with iOs 3 or 4, in which case you would need to go through iTunes on a computer to update, the update should be directly and without any issues to iOS 8 over Wifi. To update all you do is Tap the update button in Settings->General->Software Update And follow the prompts. If Doing it through iTunes on a Computer you do the same thing but in iTunes instead of on the iPad itself.

Update the iOS software on your iPhone, iPad, and iPod touch - Apple Support

and yes I was reading other threads regarding the problem with buying a used one and the previous owner not getting it out of their user ID . . . what question should I ask the previous owner before buying a used one?

The first thing to ask is if it has been removed from iCloud and has been restored. As confirmation you can ask for is a picture of the iPad turned on. If its not in the following screen, it has not been correctly removed from the account and restored.

Do not buy an iPad that is at the Home Screen or any other screen.

It must be on the Hello screen. You can also request the iPad's serial number and validate the Activation Lock status here:

Check Activation lock status of a device

Thanks this is helping very much.

Glad I could help.