I wouldn't do it for the following reasons:

1. I don't really want to be immortal.
2. I don' think I'd make a very good God; too much responsibility.
3. There is no such thing as absolute peace.
4. My loved one would be dead, at my hands, and in the most brutal way possible.

So, yes, I'd have power, but I also would have to live out eternity knowing what I did and what I did it for.

I mean, don't get me wrong, I'd do it to anyone else. I'm all for that. Just not someone I love.

P.S.~World peace is wishful thinking. Too many different kinds of people for everyone to cooperate.