ghetocowboy>I would be very cautious about which is the best. My burners dont like Phtalocyanin (Sony 948/921/900) and so TY 8X Gold reflection layer, Normal 8x TDK, TDK 71minutes CDRs and TY 63minutes CD-Rs give the best results for me. Oh well the "Sound" I like. There is only 1 Disc that I think can beat the rest and the only Phtalocyanine Disc working for my drives because it is the only disc produced to match older sony drives which is the Ricoh NY74+MA which is only available to recording studios (I got 10 from a friend working for a big recording studio and it is impossible to buy them as normal user) and has a price tag of 8000 yen (around US$80) per disc (5 disc spindle is 15000yen). But well thats only my oppinion.
Burning speed depends on your burner. I think that if you got a 12 or 16x drive 4x would be good but with a 52x drive the spindle motor is not so good tuned for low speed burning and 4x would not give excellent results. Also I would say it depends on media used as high speed medias are not made for slow burns. Mitsubishi 48x discs are labeled as 4-48 and there is a special line for 1-16x burning. I myself get the best results a 1 or 2x.
But good "sound" for me is not good "sound" for every person and I dont want to insist that this or that is the best! If you are Happy with the "Sound Quality" of your disc/writer/Audio System combination then thats the best you can get for you. Thats also the reason why I write "I think" or "the best for me" as it really is a very personal thing.
Edit: I like to say its the same as with the opposite sex. You maybe have had the experience seeing a good looking real hot Girl walking with a guy and thinking wtf why is that girl walking with such a bad looking guy..... or meeting your friends girlfriend for the first time and ask yourself where did he look at??? Well the whole world would be a mess if all Male would like the same Female or vice versa. If you like that Woman/Man then thats the best for you regardless of what others are saying or thinking. Thats the same with audio....