Why limit this to Gen 2 ASICs? The last month has shown an extreme speed up in network hash. 50TH jumps took from 22Jun to 7Jul, 7 Jul to 27 Jul, 27Jul to 5 Aug, 5 Aug to 10 Aug, 10 Aug to 14 Aug, 14 Aug to 18 Aug. It currently looks like 18 to 20 Aug may be the next jump.
BFL is shipping. (yea yea, make all the fun you want, they are still shipping)
ASICMiner is dumping overpriced USB sticks.
Avalon just shipped 240-350TH of chips depending on who you listen to.
BitFury is supposedly up over 50TH
KNCMiner is coming soon
Cointerra?
I'm sorry, but if you don't have it in hand today, I highly doubt you will get anywhere close to RoI.
Had a guy in chat yesterday offering to sell 60GH BFL's he had in hand for $8000 each. I told him he was high and that I doubted I could make RoI at $4000 and would only offer him $3000 if he paid shipping and guaranteed them to be here today.
A lot of these companies are going to go bankrupt if enough people put 2 and 2 together and see their money disappearing into an uncontrollable hash increase and start demanding refunds. Why oh why do you think BFL has been denying refunds??? If they truly have only shipped 10-20% of all paid orders, that's a huge chunk of change to lose.