My vote goes to TDK XA80 CDR Digital Audio
Odyssey used to stock but now i order (Alabang by National Bookstore). I order in lots of 10 and typically they call me within 15 days for pick up.
My guess is 5 years without any problem and the discs look as new.
I cannot say this for any other CDR, but i have not tried black discs.
I burn at 1x speed.