Ridata/Ritek discs have a mixed reputation at best. Put simply to someone that is new to DVD burning, dvd media, etc. - absolutely avoid their -R media as their 8x -R media (Ritek G05 media code) has a ton of problems with burning well initially, only to deteriorate to unreadable in a matter of months. Their +R media is still decent overall and seems to have avoided the deterioration problems that plague their newer -R media. If you want further info or want to discuss it more, it would be best to go to the media forums here.
Regarding DVD Santa, I've used it once or twice and it seems decent, but I can't really make much comment on it as it has been a long time since I've tried it. There are alot of different conversion programs out there though.