I used to use less costly alternatives. You can get devices for a lot less, your business focussed devices from HP, HTC etc but I have settled on the JUNO for now. Your cheaper devices are a real compromise for field use. Generally they will be phone focussed, have worse battery life, worse screen for daylight viewing (or smaller screen) and sometimes poorer GPS performance. Its been a long time since i really investigated alternatives, the mobile landscape is changing fast, I think most HTC devices are coming out with Android now so they are out for arcpad.
There are some good alternatives for a bit MORE $$ than the juno - Nautiz X7/Getac PS236.
Just do a search for windows mobile devices with integrated GPS and camera, there doesn't seem much around these days in that form factor (not available in Aus anyway).
Mick