Alright...not being much of an Apple guy...but my wife likes her iPhone and iPad...I have a few questions.
We now have 5 devices (ipod nano, iPad2, iPhone4s, iPad mini, and wife will have her iPhone 5 for work this week).
I know I can put all 5 on one account...but we are setting up an apple ID for her (first one was mine as I had the iPod first).
She would like to keep her iPhone5 and the iPad mini on the new ID and separate from the other 3 (yes, we know we can turn off a lot of the sharing things...but she is already pissed that so much of what my kids do on the iPad ends up on her phone...more of a story of them messing with the settings after I had them set up for her nicely).
Is it best to do it with 2 IDs? Or just more of a pain?
Anyway to then still sync over some music I already have in iTunes to her iPad as she is about to head to India for work and would like some music on her new iPad?
If I can't...its no problem as so much of the music she wanted was from CDs that I have ripped on the computer already and can add through iTunes on her Apple ID if I need to.
Personally, I have way more than that all on one ID. I wouldn't ever want to split IDs because you pay more, i.e. every app that you want on both IDs you pay for twice. That said, if your wife just wants music and her apps are all free/no one else uses then having two IDs might be worth the pain (can't get rid of the wife

).
Also, if you aren't as familiar, I think you could solve this easily. When you setup her iPhone, you probably didn't realize you have it setup to sync new stuff automatically. This would mean that everything anyone downloads on their device using that ID is added to her iPhone automatically on sync (or even downloaded via the cloud). On iTunes when you sync the iPhone and you are on the Apps tab, make sure the "Automatically sync new apps" option is unchecked. Once you do that anything done on the iPad will not affect her iPhone. If you do that, I think your wife will be cool and you will be happier knowing you don't have to load music/apps/movies onto two different IDs, which I think means two different iTunes instances. Not sure on the last part, maybe iTunes is much better for multiple IDs now, but I kept admonishing my wife for installing iTunes on her laptop with another ID and finally got her to realize that I will handle her syncing, etc. She just downloads new music/apps on her iPhone directly and I sync her iPhone occasionally to back it up and change movies if she is travelling.