Your 1000 ccf will work on a 2000/6000 or even any of the Marantz's. No coversion is required, but any of the new remotes additional features will not be programmed. Obviously the additional buttons on the 6000 will not be programmed. Since the 1000 doesn't have a Universal Data Base, this will not be a factor either. The new 3000 would require conversion, but I'm not familiar enough with it to offer any opinions.
As far a color goes, PE 4.05 can convert your ccf to color - the results are quite bad I'm told. You could try it, but I'd save a copy of the B&W version just in case.
Jim L