I seem to be floating around .028-.031 BTC per day. Even though I'm in a big pool Variance will always be an issue. Can't quit my day job over it but I'm pretty enthused 
So - It looks like you are generating about a .80 of a bitcoin per month? That is not bad for a $500 miner. S3 Antminer looks like the best bang for the buck. Would you agree?