When you just forward ports (PAT for inbound), those ports would also be wide open. Most of those ports look like nothing to be concerned about.
Gotta say, PS3 is gay for ...
1. Making gay NAT types that don't exist and are not a standard.
2. Requiring users to use them/understand them.
3. Making their descriptions even more gay than the actual creation of them.
Also, understand that 95% of home users are not going to have a true "DMZ", maybe something called DMZ on a home router. Otherwise it looks like they mean OR are using uPnP or the ports are properly forwarded. Which is probably what everyone is doing.
To answer your question j99frc, none of these PS3 NAT types will likely help you. Question, is it your voice that is garbled, their voice (everyone's or just specific people) or both? During this garbled voice period does your game lag at all?
If it is just voice and your voice only, remember that voice is one of the most sensitive things out there. That's why QoS is a huge deal on corporate networks, but impossible to implement over the Internet. What kind of Inet connection do you have? If DSL, it could be as simple as a bandwidth issue. DSL has poor upload speeds and between the PS3, and/or maybe something else going on it could cause problems with voice. Also, is it alll the time or intermittent?