Install Windows 7 RC or RTM?

To install as a primary OS?
RTM if its legal, the RC will stop working at some point next year anyway.
If you have preordered it you can install the RTM and re-arm it for 120 days even even if you dont have a CD key at the moment then in October use the valid CD key without needing to reinstall (see that other thread you posted in).
 
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