I have a PDA. It's a palm m105. I bought it in grad school after I missed one too many meetings. I considered several options to spending over a hundred bucks, like small notebooks and the like. In the end though a paper notebook won't beep and annoy me if I forget something (like jury duty that was scheduled months ago). So the palm was a good investment and I still use it regularly.
If you are looking for something with 90% of the functionality, then there are two possibilities you might want to look at. The first is the Pocketmod. It's a sheet of paper you make with flash program. Using some creative folding, you cut and fold it into an 8 sheet organizer.
Nice, but there is no way to hot sync the thing with my datebook. What I really want is a pocketmod program that interfaces with my electronic calendar at work. That way I print out one in the morning and I have everything I need to do that day in my pocket.
There is also the Hipster. This is a stack of 3x5 cards binder clipped together. You write on them with a pen. The hipster mini uses business cards instead. If the bind clip bugs you, then several index card or business card holders are available at office stores.
Via Evangelical Outpost.