Yep, 70ish BTC is also the figure I'm considering from the very first minute to calculate ROI. I paid in $$, but you know, the right way to calculate the return is to see if you at least recoup the same amount of coins you could have bought with your $$ when you placed the order. The miners are still profitable, but honestly is not looking very good. If they are only a couple of weeks late, it will be hard to reach break-even.

Do not forget that all those calculators consider 100% uptime, which never happens. Calculating 90% to 95% uptime is much more reasonable, I'd recommend to insert 360GH/s as hashrate for a 400GH/s unit in order to factor possible downtime.