I agree with dave3. I started out slow in July 2011, learned from my mistakes and with a lot of help from people on this board. When I stopped mining my relatively small 10 GPU farm this past April I had earned ~550 bitcoin, which I havn't sold. Now my expectations for the one SC Single I have on order are much more tempered. Probably won't do any better than my GPU results over a similar timeframe and most of that will be front loaded.