I'd probably pick Evil of the Daleks due to it being my favourite Dalek story. We need at least one complete 2nd Doctor Dalek story! I know Power is more historically significant but Evil is undoubtedly the better story.
Power Of The Daleks. Not my most wanted story, that would be Abominable Snowmen or The Massacre. But I would be willing to take the dive to get Pat's first story back. It would need to be done. Everything else is secondary.