You cant go wrong with the CMUCam or Blackfin Series for the blob recognition
and for bumpers, you can use SRF05, Ping))), or Sharp IR's
and for servos I really liked the HS645 MG for my Biped, but they are a bit of an overkill, atleast for my 1.5ish foot robot
Also the Axon is an overkill, a simple Atmega8 chip will do the trick ($3) but the Axon is good to have I guess, I plan on ordering one in the near future.