Thanks... by "either" I meant the two cards Apple marketed with most recent MacPro's-- the GTX 285 or the Quadro FX4800. I figured that to be the case, and I appreciate your confirming.
Some people have been unsure and asked if even the GT120 which shipped as OEM in 2009, so there are at least three Nvidia that are 'recent' and GT120 is still currently available. More than can be said about ATI/AMD.
I thought 10.6.5 might result in some more cards being taken off the "unavailable" list 😟