Help me choose an Account type

Hi,

I'm building my new all-in-one HTPC/Nas/Gaming Box, that will be running Windows 8 because of File History killer feature.
I want to backup my critical datas daily into SkyDrive, and use my Xbox account to download/play games.
But I'd like to use a local account, named "HTPC" for example instead of my regular Windows Live ID.
So is it possible to have la local account, that will sign in with a live one for skydrive and xbox applications ?

If it's not possible, let's imagine that I create a local account first.
My user folder will be in C:\users\htpc\ exact ?
Now if I convert the account to a Live one (and disable all Sync options), path is still C:\users\htpc\ ?
Is it possible to change displayed name ( "HTPC" instead of "FirstName LastName") only for my htpc ?

Do you have any idea ? or suggestions ?
Thanks

Good question. Subscribing to hear the answer if there is one... (Besides everything you mentioned, this would go for the app store as well...)