I'm trying to find A1's on ebay, and I'm not able to find any... Are they BitMain or made by another company? Yeah, You're right, I am looking for a bigger bang for my buck, but also if it's using more power then I will need to buy more PSU's, so i'd need to calculate that too.
There is a BUNCH of companies that made them. A1 is the chip that they used. The most popular was lketc Dragon 1T's. But I would do some math between that and S3 see which is best. The S3 will hold value better.
But I'm not sure on current market I have a feeling one of those two will be cheapest per GH and still viable miner.