How to get Tivo to select SD over HD

I have a Tivo Series 3.
Got the Tivo Program Data upgrade today. Not too bad...

Before the update, Tivo would always select an SD station over an HD station when taping from a wishlist. This was actually good - old Tivo box can only store about 11 hours of HD shows. For wishlists where I really *did* want HD, there is a wishlist category called "HD".

Now with the upgrade, Tivo is selecting HD stations instead of SD (again, only a problem with wishlists). But there is no "SD" category.

So how do I tell Tivo to select SD stations over HD stations - by default - in wishlists.

thanks