There are ROMs out there for the WM8650 that have AD HOC enabled. You need to find the ROM you want and flash your tablet. I would recommend this thread: http://www.androidtablets.net/forum/wondermedia-based/15943-complete-morons-guide-rooting-your-wm8650.html as a good starting place, covers both Rooting and Flashing, and provides links and comments on various ROMs.
As far as tablet recommendations, there are too many under $250 now to really give a specific recommendation. You may want to stick with something as close to what you already have as possible in order to make on-going management easier.
As far as tablet recommendations, there are too many under $250 now to really give a specific recommendation. You may want to stick with something as close to what you already have as possible in order to make on-going management easier.