The 1500gh/s miner is something like Holy grail. It doesn't exist and won't exist in next 6 months.
I know, but in those 6 months a ridiculous increase of hashing power will need to happen. It will need to increase by a factor of 10.
It will. There are 2 batches of 600 Avalons on their way and some 250TH/s from Asicminer. Also, Avalon team sells chips, currently some 500 thousand 280MH/s chips has been sold. Those are awaited in 4 months.