Hi.
I know one thing. You can write directly with the pen on the PDA instead of using the "viritual keyboard",
And secoundly, there is cheap PDAs for "organize only" purposes.
I would recommed taking a look at the Palm Zire series.
The cheapest models costs less then 100$ (if not eaven cheaper)
And one of those should be exactly what you need!

Atleast thats what i think.