Use the money to buy bitcoins and hold till their value appreciate.
The ROI for miners order now and deliver at an unknown time (end of the year if you are lucky) is so small that you would be lucky to recoup your "investment" in the foreseeable future.
Here's my final descision:
I will continue saving money, but in the form of bitcoins. You know how, 3 days ago, the price of bitcoins went down to $96? When something like this happens again, I will convert my money. I will keep trading until I have enough bitcoins to get a butterfly ASIC. That way, I can choose to get the miner in the future, or have my bitcoin investment ready for a return.