i think u can use pretty much ne colour dyed disk. In the past i have used gold, light and darker blues and silvery gold. At the moment i am using silvery gold memorex discs and i haven't had any problems or errors with one. I use them for all my psx games and they work fine.
You can order them in packs of 50 (on a spindle, no cases) for £20 from www.jungle.com
They are called 'Memorex 80 mins (700MB) and they can handle up to a 12x write.
I recommend them, becasue if i use them then they must be pretty good
l8er,
4nim4l.
P.S u gotta watch out for some cheapo disks because sometimes they r cut with a slightly larger circle for the spindle and have trouble spinning. Try and avoid PC LINE discs too. They r cheap and nasty (these r the Dixons, Currys and PC world disks btw - i used to work there so i should know how crap they are

)