There's an "HD" flag that shows in the guide, but it's not entirely reliable (some HD shows don't have it, and a few SD shows do). You can specify it in Wishlists by choosing Category > HD. To make it a preference, create two WLs, one with the flag and one without, with the flagged one having higher priority.
I used to do all that, but now I just take the SD channels out of the guide. Most shows are in HD now anyway.
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