I rip with DVD Decryptor first to remove region protection, etc. If the full ISO fits on disc, burn with same. If it doesn't, I'd recommend Pinnacle Instant Copy (takes 2.5hrs on my P4) for the best quality downsizing; DVD2One (takes 10-15 min on my P4) if you don't mind sacrificing quality slightly for speed.
As for probs with Nero ... Ahead cleared that up in version 5.5.10.x +
RecordNOW I'm not very fond of. I've had some compatibility issues with it with certain media. Odd problems like discs only closing in Wizard mode.
Can also recommend DiscJuggler ... great for DVDs.