XMDirect and Smart digital Adapter

Gents,
before im going to CC. i'd like to verify if these will work.
i have 08 prius.
here's the link

xmdirect:
http://www.circuitcity.com/ssm/XM-U...93341/catOid/-13091/rpem/ccd/productDetail.do

and the adapter? which one of these?
this?
http://www.circuitcity.com/ssm/Terk...20864/catOid/-13091/rpem/ccd/productDetail.do

or this?
http://www.circuitcity.com/ssm/Terk...23087/catOid/-13091/rpem/ccd/productDetail.do

and.. do i need to remove all the dashboard or just the passenger side and sneak-in to the stereo.

any pics how to do it will greatly appreciated.

Thanks!