So, with the upgrade kits at .46 BTC each and the S3 at .58 BTC each.  At a $550 BTC price, that makes the S3 $319 and the upgrade kit $253.  I opted to just buy 2 S3 units instead of upgrading my 2 S1 units as I can sell them on eBay for much more than $66.  I hope the S2 upgrade doesn't follow the same price structure.

Hi, My mining shelf got bumped today and 1 of my Antminer S2 units powered off.  When I powered it back on, it went through the startup just fine up to the IP address screen but will not communicate.  I checked the inner and exterior network cable connection.  I reseated the boards and flashed a new SD card but the same result.  I tried connecting directly from my laptop to the Antminer, bypassing my router but still no communication.  The unit is about 2 weeks old.  Any advice I could get would be greatly appreciated.  Thank You!

Has anybody bought a S2 unit with the 1 year hosting?  With the cost of electricity where I am, the annual cost after the cost of the machine is only like $150.  Plus I don't have that heat to deal with.  Thanks!