This has been beat to death and recently. Please read through the forum, you will get all the answers you need.
It is a bit too late, as OP has already bought the ASICs "cheap" off ebay...
On the bright side, he is mining for fun.
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
However is there any profitability with mining? I'm seeing people say that even the S1's are no longer retuning the ROI.
Sorry to tell you, but I don't think you can get ROI at all, unless you get extreme luck in solo-mining...