I am considering having an ASIC or two again; but it needs to fall into the realm of the S3; ~400W power consumption, and very inexpensive ($200 max purchase price) and easily re-sellable. A smaller miner like me can easily justify it and find paths to ROI with my power and budget constraints. When I see things like the D3 hit that range, where I can buy, use sell and buy again like I did with S3's a bit ago.... Winning strategy.
Unless something crazy happens, the next ASIC miner I buy will probably be from sidehack. Although with the price of BTC down, he is sitting on a sizable number of 2Pac miners that is slowing him down a bit. I'm hoping that he can get the 16nm usb stick miners done before too long, and then get to the 16nm pod miner he's been wanting to do for a while.
When I look at the prices of new ASIC miners and the value of any of the coins they mine, ROI is usually one or more years away with the current network hashrates and difficulty, and we all know how that works out.