i generally use pete's d3d plugin (dx6 one), i don't know why the opengl plugin crashes when entering battles
this plugin is fast in some cases but i highly reccommend the soft plugin though. (you'll see what i mean when you enter the dungeon of efreet).
sound: iori's directsound spu (click default, then check all options)
cdrom: epsxe internal (no options checked)