Welcome to the forum -.-PhanTom-.-
Personally I would avoid Rivision like the plague. El-cheapo media with no guarantee of quality whatsoever, you can end with discs of any grade, from OK to awful, even in the same batch. :Z
I don't like Memorex generally, but the CMC Memorex can be totally OK in NEC drives. Actually most CMC discs give rather good results in NECs, assuming you kept the firmware of your rather old burner up to date. But do not expect good results from CMC in just any burner. You an end up with coasters in several Pioneer drives, for example.
The "safest" choice here is of course the Verbatims, but in a 2500 and/or 4550 I'm not 100% sure they will have a clear edge over the CMC MAG M01.