1) To always be extremely healthy for my age. Anybody who doesn't wish for this (or some variation thereof) is in for a shock. I don't want to live forever, but I do want to be vigorous, pain-free, and cognizant for as long as I live.
2) I'd want to always have enough money to live comfortably without working more than I want to. I don't want to be filthy rich - that brings it's own set of problems. For example, the idea of live-in servants is sort of wierd. But to always be finanically secure is a good thing.
3) That the advantages of these wishes always far exceed the disadvantages. I've read too many genie stories to forget this one.