My hardware costs for my 3.6 Mh's were $1600 CAD including everything, but most of it was bought back in November. I could cover my initial costs by selling 4 of my 7 gpu's since their value doubled since I bought them, but my plan is in the event scrypt mining becomes unprofitable, I will keep a few GPUs for have a wicked gaming system (currently only using an old GTX 470).

I have actually paid off about 70% of the rigs from selling some BTC, and the value of my remaining BTC more than covers the last 30% and then some, but I keep it to trade with.