Thanks, perhaps Mint isn't the right way to go at the moment.
Yeah, this'll be the only PC in use once it's settled so interchangeability isn't too much of an issue. As long as it doesn't cause any issues for my daughter for school, and I don't see why it would.
Primarily Unity and performance. Now that you mention it, I should give one of the others a go. Do Ubuntu package an ISO with Gnome any more? I thought it had been replaced by Unity (I know that Kubuntu/Xubuntu etc. exist).
Hmm, I'd like to keep it relatively light so perhaps Xfce is the way to go.
I've instructed everyone to keep their data in Dropbox during the transition so that messing around doesn't cause too many problems.