I agree with $30 per gigahash (today). Next month it will be worth $20 since KNC is priced around $20 and will be shipping which will make that the current price per GH. I would pay a 50% premium ($30 today compared to $20 next month) for a miner today.
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here is a full comparison.
http://minr.info/Thanks for that link. What I think is most important about the information is that nearly all of the entries say "Not shipping, no working product seen."
As I wrote before, all the expectations for ASIC miners so far have been wildly optimistic and innaccurate, and I don't think the situation will improve. It is unlikely that KNC will be shipping hardware next month for $20 per GH/s, and it is a bad idea to base your value on them meeting their goals. I also wouldn't be surprised if at least one of those companies is really a scam.
KNC posted that they are still on target for a september release. This is the first group to offer ASICs produced by a company with history. ORSoC has been doing this for 10 years with projects much more complicated than BTC hashing. (It is only a month away so we don't have to wait long to see if they deliver)
Labcoin just released IPO shares but I highly doubt they can deliver so quickly considering they are just getting into the game. (
http://www.labcoin.com/) It appears that they have some experience.
Next month is going to be a major milestone for BTC. So many companies releasing miners, it will be interesting to see which ones arrive. Any high powered ASIC with mass distribution will crush competition. Up til now, no company has delivered to the masses. Everything has been in small batches. The USB sticks were done but I just don't count that due to the high price and low hash rate.
Keep an eye on BitFury, KNC, LabCoin, and companies using the Avalon chips. The Avalon chips suck up power but they have so many chips being shipped, it will make a serious dent in what 1GH/s is worth.