All depends on if and when ship starts...
Do you mean Bufferfly labs?
If so people have been waiting so long for BFL. Try not to plan anything around them. Also as soon as they ship the difficulty will jump very high.
(If they ship you will NEVER mine 5GH/s when the network is at 70TH/s, by the time you mine 5GH/s the network will easily be 200-500TH/s and above)