Denny,
It makes little difference if the paint is catalyzed or not. It also does not matter what company makes the respirator. Those you listed are all reputable. I prefer a full face over a half face respirator, just because it eliminates eye irritation.
What does matter is that the cartridge must be rated for the paint you are using. In order to determine if a cartridge is rated for the paint you are using, you can go to the PPG site and print out a copy of the MSDS sheet for the paint you are spraying. Cross check the compontent and concentration list of the cartridge with the component list in Section 2 of the MSDS. Both the ALK-200 and DP50FLF have a littany of VOC compounds that need to be addressed. Most of which can be taken out with a standard activated carbon cartridge rated for paint fumes.
A lot of paint cartridges have an exemption warning for polyurethanes due to the potential for free isocyanurates, which a paint cartridge will not take care of. You likely won't find a paint with free isocyanurates in most automotive finishes.
The only one that I have seen used on several trucks is Imron from DuPont. This is an aviation paint that requires the use of an air supplying respirator because of what is in it.
