Bitfury will be nailing the coffin shut of both BFL and Avalon, unless Avalon gets their shit together and batches of chips start arriving this coming week. Actually, BFL is already pretty much dead and gone already, and Avalon is really close to finishing up digging their own grave.
I have lots invested in KNC, so here's hoping the technical release they are saying will be out next week is a good one and puts all this FUD to bed.
Bitfury are expensive, same price roughly as BFL. You will be hard pressed to make a decent ROI so late into the game at that price.