NAVTEX for Pacific

[crazy goose]

I have to make a decision on the purchase of a new navtex. This year we cross the Atlantic, but next year we are going south and then project to go into the Pacific.
I have a choice between a dual band (i.e. furuno nx 300 ~ 500$) or a triband (i.e. furuno nx 700 ~ 1800$).
Channels 518 and 490 kHz cover very large areas, but apparently do not give much information when in the Pacific, where channel 4209,5 kHz seems to be required.
Question : based on experience, how do you evaluate the need for reception of the 4209,5 kHz band in the Pacific (unnecessary/recommended/indispensable)? Does the use justify the expense?