Which edition of nero are you using? The newest one is full of bugs (ver. 7 unless you update it from the nero main web site). I use Sony discs all the time with nero to burn video files and (as yet) have never had a bad burn when a load of others have had problems with skipping and freezing. Look on your burners manufacturing web site if a firmware update is avalible as a 1st port of call for your drive. 2.4X is usually the max speed i get from DVD-RW/DL discs and nero should at least give you the option to burn them at your drives max speed of 8X. If worst comes to the worst, i'll buy them off you, but they are by no means coasters. Plod around afterdawn and doom9 for help.

Sony use Ritek discs to some extent or another aparently. Tuiyoyuden are supposed to be the top brand though.

Also found this a while ago on the subject, though it's older media:

1ST CLASS MEDIA
Almost flawless burns with 95-100% reliable results:
PVC = Pioneer = (-R)(-RW) ... media is no longer made
MXLRG01, MXLRG02 = Maxell = (-R)(-RW) ... be aware of fakes
TAIYOYUDEN, YUDEN, TYG01, TYG02 = Taiyo Yuden = (-R)(+R) ... be aware of fakes
MCC = Mitsubishi Chemicals = (-R)(-RW)(+R)(+RW)
TDKG02, TTG01 = TDK Corp = (-R)(-RW) ... be aware of fakes

2ND CLASS MEDIA
Decent discs, though not perfect, about 80-95% success rate:
PRODISC = Prodisc Media = (-R)(+R)
INFODISC = Infodisc Media = (+RW)
SONYD04 = Sony = (-R) ... be aware of fakes
RICOHJPN = Ritek or Ricoh = (+R)(+RW)
RITEK = Ritek = (+R)(-R)(-RW)(+RW)
OPTODISC = Optodisc = (-R)
FUJIFILM = Fuji = (-R)(+R)