iPAQ OS Upgrades ROM sizes

Archived from groups: comp.sys.handhelds (More info?)

I am looking at buying a HP iPAQ 4350/4355 or 5550/5555 but I am
concerned about the ROM sizes. I like the keyboard in the 43XX but I
am concerned that the 32M of ROM (2.8M I can use) will not be enough
to sustain OS upgrades in the near future (like PocketPC 2004/2005).
Is it safe to assume that PocketPC 2003 takes ~29M or so? How much
does the OS usually grow every year?

Bottom line is that I like the keyboard since I will use it for
wireless activities and such, but I want the larger ROM (to sustain
upgrades in the future). Any advice would be appreciated.

Chris