Palm (or other) with anonymous proxy

I am looking to buy a used Palm Tungsten C, if it will do what I want.
I want to be able to connect to a wifi network (this model comes with
a wifi card), set the Palm to use an anonymous proxy (I enter the
address/port), and go to hotmail.com or yahoo.com and use an e-mail
account. There are a couple sites that keep updated lists of public
proxy servers. This procedure works fine from a PC (MS Windows).

I found some stuff on the Tungsten C, and it says you can use special
proxy servers that reformat the web pages, and says how to enter the
address/port. I assume this will work with any proxy server, not just
the Palm supported ones (less the web reformatting, of course).

I want to buy a used model. Any problems with the early ones?

Any other products that will do this? I'd prefer something smaller
than a laptop, and because I don't want to use it for anything else, I
don't need any fancy bells and whistles, and want to keep the cost
down. (Or maybe I'll end up finding web surfing at wifi spots more
handy than expected.)

Thanks.