This is a tough question: although Plextor writers rule (big time), they cannot handle SD2, except for the 8X model. You should check this news posting for some good information about this matter.
There are drives that can do it like the Philips burners but on evey other aspect they are inferior to Plextor.
If you don't mind using a crack for SD2 but you can do all other copy protections like SafeDisc, SecuROM, etc. you should go for the PlexWriter 1210a or 1610, but I have some doubt on the 16 version since it has some problems with Fast Error Skip and RAW writing...
Goodluck with your choice.