So i have been bittin by the bitcoin bug also. Im fairly new to this and of course i have made my mistakes in jumping on some bad ideas.

I live in NYC in a Coop (its like a condo with electricity included with my maintenance) so power is never an issue for me. Summer time i usually have the AC on 24x7. After i started reading about bitcoin and electricity not being a factor for me i decided to start the easy way and buy a BFL Jalapeno. I did get a good deal and got a 10gh for around $250 on Craigslist. (ebay has them going over $800 right now). But i wanted more so i decided to read more on it and started to scrypt mine. I got 2 asus R9 270's over clocked and doing over 900 mhs. But the fans blowing on them is getting a little noisy.(AC on the winter makes it too cold in my apt... lol.) Im now thinking of trading them all in to get a antminer s1. And if that goes well ill purchase some more.

I guess my question is, if you didnt have to pay for power what would you build to generate some profitable bitcoins?