Yes, PDA's have many purposes and unless being a phone too is one of your needs than that would be a reason alone to buy a pda that isn't a phone too.
PDA's that play music are not as uncommon as they use to be, however, for the best quaility check the PDA's at cell phone providers.
Verizon no longer offers a free PDA with any purchase as they have in the past. Before, one could buy a phone package or other contract and receive a free PDA, but that is no loner the case.
Yes, there are PDA's which have a bluetooth feature.
Yes, there are PDA's equipped with a WiFi feature.
Yes, PDA's will play music files.
Any PDA with Windows CE (or a later Windows operating system) can open Office documents.
Microsoft makes voice control software for any PDA,but many of the latest PDA's have voice recognition.
Many PDA devices actually come equipped with GPS capabilities.
yes PDA also have and (OS) operation system any hand held computer has an OS
Personal Digital Assistants are typically computing and internet browsing devices used with styluses, usually for work reasons, while cell phones are any device that offer calling, and usually texting services.
Almost all PDA's have custom covers available. The iPod, if you consider it a PDA, has a huge variety of covers for purchase.
iTouch will have a better battery span than a PDA will however there are far less applications on an iTouch than you can get with a PDA. A PDA is still more appropriate if you need it for computer functions� iTouch has more entertainment value. Touch does not support WMA files which is a music store standard. You can only play what you buy from iTunes. PDA's have the ability to play pretty much any music. The storage capacity of an iTouch smashes that of any PDA although PDAs are capatible with SD and CF memory cards so extra memory is always an option.