You might not need it now, but there might come a time when the RUU comes in handy. To snatch it up, click on the sourcelink below. The HTC One Developer Edition comes with 64GB of native storage, an unlocked bootloader and of course, an unlocked SIM.
The Developer Edition is not to be confused with the Nexus Edition version of the HTC One which will be offered unlocked, but compatible with AT&T and T-Mobile, and come with 32GB of native storage, The Nexus Edition HTC One comes with stock Android (well, close to stock since it needs to use Beats Audio for sound) and will be driven by Android 4.2.2. This variant of HTC's Android flagship will cost $599 from the Google Play Store starting June 26th.
source: HTCDev via AndroidCentral