Have you looked here at the three different boards available?
http://circuitco.com/support/index.php?title=Main_Page
Look at the WIKI for each board. Then Read the System Reference Manuals to get an idea on which may be the closest for what you need. Then focus your questions on that one to see if it can do what you need…
Beagleboard is $125
BeagleBoard-xM is $149
BeagleBone is $89