Create a season pass for your favorite shows using the HD version of the channel. To do that, just find the show on the HD channel or do a Search by Title, click the show on the HD channel, and select 'Create Season Pass.' If you do that, the show will always record in HD when available.
If you want to auto-record content by keyword, genre, actor, etc, but want the TivoHD to only record HD programs, then create a wishlist and select HD as your first category. The HD wishlist category means "HD only." If you want to auto-record all content by keyword / genre, but still want to record SD if no HD version is available, then create the above wishlist with the HD category, and then create the same wishlist without the HD category and place it at a lower priority under Season Passes.
If you want to auto-record content by keyword, genre, actor, etc, but want the TivoHD to only record HD programs, then create a wishlist and select HD as your first category. The HD wishlist category means "HD only." If you want to auto-record all content by keyword / genre, but still want to record SD if no HD version is available, then create the above wishlist with the HD category, and then create the same wishlist without the HD category and place it at a lower priority under Season Passes.