I would recommend not bothering if you are thinking of surfing the web and checking email. More econmical and efficent if you just look for a Internet Cafe. I have found them everwhere. You are unlikely to get a PDA for under $250 with WiFi built in. WiFi isn't ubiquitous, expensive when not free, and frustratingly slow to use on a PDA because of the slower inputing and all the scrolling involved with screens.

I have a Sony TH55 and used it in the free WiFi and used it in Vienna in the museum quarter and it was tolerable for a lazing Sunday.