[CogitoCogito]

I use timestamp instead of timestampz in a database I set up. My reasoning was essentially the same as yours. I wish had used timestampz. The storage size is the same. It's more explicit that the timestamp actually is UTC. And if you want to want to display times in local timezones (when things happen in my life to me, it's easier to use my current timezone as a reference point), then you don't have to do casts and instead just set your session time zone to what you want.

Then again, I think the most important thing overall is just that you should store your timestamps in UTC no matter how you do it. Worst is coming into databases and finding they are storing PST just because they happen to be there.