Hello my friend, I've missed you. Is it too boring at one of AM threads ?
None of those companies can match the price point of SP30 with current gen and Q3 planned hardware.
It has already been done.
http://shop.rockminer.com/goods.php?id=342880gh for 4btc.
Don't forget 4x PSU's to run them, and 1.2w/GH is going backwards, machines need to be getting more effecient not less.