power switch?

need to grab a power switch for a case,
I need a momentary switch, right?
I've seen:

• momentary
• normally open momentary
• normally closed momentary

I was thinking it should be normally open, but....

Yup. Normally open.

I just picked up four of these Lian-li switches and consider it the deal of the century.
Much nicer than the crap from Radio Shack.
They lack the lit ring around the button and the short throw of my Bulgin switches, but then again, they only are 1/4 the cost.