RicohJPN R01's would be the way to go, unless they have updated the firmware recently. All the Yuden T02's I burnt with my 812s had to be reburned because of a crap write strategy for them. Those Ricohs can be found under many brands, but I would try to find some Imation or FujiFilm branded 4x+R's if I could. The RicohJPN R02's are also pretty good, can be found under several brands as well. Do a search for them at www.videohelp.com. Pay close attention to the Made in "XXXXXX", as this varies by media code, not by brand, so that you can make sure to get the correct discs. Stay away from any Memorex branded media!
Sony media is either made by Daxon (if 8x+R MIT) or TY (if 8x+R MIJ). 16x+R MIJ is usually Daxon. There have been reports of Yuden T03's, but not in USA. 16x-R's can be TYG03 if there is an octagon spacer instead of the round one.
HP is normally CMC MAG, but there is some MCC media code floating around for HP branded discs. Memorex is crap, doesn't really matter what media code it is.