Actually i am looking at upgrading my 32bit OEM Home Premium copy to 64bit. Since i've already paid for it (legal copy), i might as well look for an upgrade path. So far, a few local shops only sell full 64bit vista rather than the 'upgrade' option (if there is one) which could be just a fraction of the full cost.

Do you know if such upgrade option/package even exist? One thing i do know is that a full re-install is required which i don't mind.