712: 12x DVD+R, 8x DVD-R, 48x CD-R writing.
716: 16x DVDÂ±R, 48x CD-R writing.
755: 16x DVDÂ±R, 48x CD-R writing.
760: 18x DVDÂ±R, 48x CD-R writing.
All of these are capable of quality scanning with PlexTools. I personally prefer 712 and 716 because Plextor messed up the 755 and 760, the DVD burn quality is not as good (PIF spikes at recalibration points). I own four 716 myself and the postman is going to bring me a 712 and 708A2 today.
(Avoid Plextor 740, 750 as these are not "premium line" designs and won't feature GigaRec; also avoid 708A/708UF, but 708A2/708UF2 however is OK.)