Wireless for BB2

I would like to try to set up a wireless control system for my 4WD system:

   1) Am I better off with BlueSmirf or XBee, or does it matter?
   2) I assume I will need to connect "TX" and "RX" from the transceiver to spare
       pins on BB2, but do I need to worry about shifting voltage levels
       (e.g. RS232 to TTL)?
   3)  are there any tutorials on this? is seems most pertain to the SSC32 instead.

                     Thanks in Advance,
                             DPT

The things that pertain to the SSC-32 should easily work on the Bot Board II. Assuming they are using the TTL serial com pins and not the DB9.