May be worth mentioning that if you only need CS6 for a short period, it can be had as part of a month to month subscription to a single application in Creative Cloud. If you have a 5.5 suite you'll need to upgrade the entire suite to get upgrade pricing and you'll still be two versions out of date.
If i get the upgrade... will it be the same id?
Like i said i need access to both versions at the same time.
Do I buy the full version or just the upgrade?
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The upgrade and non-upgrade versions differ only in price and the installer looking for a qualified upgrade product. The programs themselves are the same.
As we said before, you will have no problem with both versions installed (I run back to CS3 here). If you purchase an upgrade, though, you must choose the right one. If CS5.5 is a Suite package you cannot use an InDesign-only upgrade.