Visit NGEmu for all your psx plugin needs. For video, I'd recommend anything by Pete or P.E.Op.S. (this is very much hardware-dependent; you'll have to experiment). For Sound, P.E.Op.S. and Eternal are arguably the best. For the CD-ROM, you probably won't need anything other than ePSXe's built-in system, but it's worth having Mooby's plugin for games with Redbook audio (unless you mount the image in a virtual drive, or run straight from the disk). Read all the documentation, experiment with different plugins/settings, see what works best for you.
You will need the psx bios, but you're on your own with that one. Search google.