[Yaesu] 300 Hz CW filter for digital modes?

[Clark Savage Turner]

Quick question for those who regularly use several digital modes, about 
a 300 Hz filter (I can choose one at 3 db or 6db at the edges, a Collins 
mechanical filter).

Would I be unwise to choose this over a 500 Hz filter?  I much prefer 
the 300 Hz for CW (my normal mode) but would be OK with the 500 Hz 
filter.  If a 300 Hz filter prevents, say, PACTOR, I might choose the 
500 instead.

Well, one further question, is PSK31 the main choice for low power 
operation?  Maybe that is the one I should be most concerned with, I 
plan to run QRP.

Thanks for any replies.

Clark
WA3JPG