Ps1 emulators for PSP?

A few years ago I played around with the homebrew but then my PSP broke.
I'm getting a new PSP slim and I have been trying to keep up with homebrew development for psp slim for a while now, but one of the most important things for me is going to be playing ps1 games.
but I haven't a clue as to which emulators there are.
I only know of psx-p and postation.
Are there other ps1 emulators?
Which one is your favorite?
plz excuse my noobness

popstation is the best

Yeah POPStation. It's inside CFW's though. ;)