http://www.blackarrowsoftware.com/store/prospero-x-3.htmlAt some point it's going to make sense to switch order to something like this - twice the hashing power at thousands of dollars less. If you ordered this now, you would probably still come out ahead since you would:
1. Need to make up the cost difference
2. Be hashing twice as fast
1Th/s in March at $8000
2 Th/s in April at $6000
You would quickly make up for that month of not mining at 1 Th/s.
The basic premise not is to not pre-order anything. As it stands right now blackarrow is already doing to be late of their first orders with no announced shipping date. This will most likely push back all other orders.