In Australia jpldisplays can sell MCC 03 Verbatim 8x +R inkjet printable media for A$37.90 per spindle of 50. These burn nicely at 12x on the 4163/5163 drives. In fact they're one of the few discs LG trusts enough to burn above the rated speed.
I used to buy TY -R, which also worked fine, but prefer Verbatim and the price is compellingly lower now - $20 less per spindle of 50 8x media. But in general I would agree that my LG seems happier with +R media than with -R.