I need a good mop for my floors at home. What would you recommend?

I got a cheap mop at the grocery store last year thinking that would be enough, but it broke like a month ago and always left smudges all over my floors anyway. I never really liked it. It was one of those fixed sponges with a handle to squeeze it out rather than one that looks like Medusa.

I have wood laminate floors throughout my house, not true wood floors. Unfortunately, they're dark brown and show a ton of crumbs and smudges, so I'm looking for something sorta in the buy-it-for-life category. I.e. willing to shell out a little more if it makes a difference. I've had a vacuum for a year that has been good for all the crumbs (Miele), and I really love it.

Also what soap should I be using for best results?

Thanks, all!